Cloud gypsum rock cycle division and sea level lifting reconstruction method and system based on rock electricity response

Abstract

The invention discloses a cloud gypsum rock cycle division and sea level lifting reconstruction method and system based on rock electricity response, and the method comprises the steps: carrying out the recognition of a symbiotic sequence of carbonatite and evaporite based on a logging curve, and summarizing the type of a mineral combination sequence on the logging curve; based on the logging curve and the symbiotic sequence type of the carbonate rocks and the evaporative rocks, high-frequency cycle division containing the evaporative rock sequence is carried out on the test well; based on the high-frequency cycle data of the test well, an accumulated deviation value of the high-frequency cycle data is obtained, and a Fischer diagram of the test well is drawn; and sea level lifting curve characteristic comparison data of the test well is further obtained, and cloud gypsum rock cycle division and sea level lifting reconstruction of the test well are completed. According to the method, high-frequency cycle division and strata series comparison in a small area range are completed by using logging rock electricity response characteristics, and a working basis is provided for work such as fine description, development law and reservoir prediction of the inter-salt thin reservoir.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum geological exploration, and relates to a method and system for gypsum rock cycle division and sea level rise and fall reconstruction based on rock electrical response. Background Art

[0002] The development of inter-salt reservoirs in carbonate and gypsum-salt strata is mostly controlled by high-frequency cycles, and has geological characteristics such as thin single layers, vertical multi-layer superposition, and poor lateral continuity, which also causes a lot of interference to oil and gas exploration and development. It can be seen that the realization of high-frequency cycle division of vertical strata, lateral comparison, and closely related sea level reconstruction is crucial for the detailed characterization, development law, and reservoir prediction of inter-salt thin reservoirs.

[0003] The high-frequency sequence division, correlation and sea level reconstruction of carbonate and gypsum-salt rock formations mostly rely on two types of materials, namely, continuously developed outcrop sections and continuously cored drilling core sections. The working principle is relatively similar. Based on a set of inherent standards, the formation is divided into five-level high-frequency cycles, and then four-level high-frequency cycles or three-level and two-level low-frequency cycles are vertically constructed from several five-level high-frequency cycles. On the basis of the division, the high-frequency cycle comparison of basin margin outcrop-cover drilling is further realized. The work of high-frequency cycles is relatively easy to achieve for outcrop sections, but for drilling in the basin, systematic coring cannot be completed due to construction costs, making it difficult to achieve high-frequency cycle division, correlation and sea level reconstruction, which in turn interferes with the fine characterization, development law and reservoir prediction of inter-salt thin reservoirs. Summary of the invention

[0004] The purpose of the present invention is to solve the problem in the prior art that it is difficult to carry out high-frequency cycle division, comparison, and sea level reconstruction due to system coring in basin drilling, and to provide a method and system for gypsum cycle division and sea level rise and fall reconstruction based on rock electrical response.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The method of gypsum cycle division and sea level rise and fall reconstruction based on rock electrical response includes:

[0007] Based on the mineral sequence precipitated from saline seawater, the paragenesis sequence of carbonate rocks and evaporites is obtained;

[0008] Based on the well logging curve, the carbonate rock and evaporite paragenesis sequence is identified, and the mineral combination sequence type is summarized on the well logging curve;

[0009] Select test wells, and divide the high-frequency cycles of evaporite-bearing sequences in the test wells based on the well logging curves and the types of carbonate and evaporite coexistence sequences;

[0010] Based on the high-frequency cycle data of the test well, the cumulative deviation value of the high-frequency cycle data is obtained, and the Fischer diagram of the test well is drawn;

[0011] Based on the Fischer diagram of the test well, the inflection point of the high-frequency cycle of the test well is used to obtain the comparative data of the sea level rise and fall curve characteristics of the test well, and the gypsum cycle division and sea level rise and fall reconstruction of the test well are completed.

[0012] A further improvement of the present invention is:

[0013] Furthermore, based on the mineral sequence precipitated from saline seawater, the symbiotic sequence of carbonate rocks and evaporites was obtained. Specifically, the saline seawater was concentrated and dried in turn to obtain carbonate rocks and evaporites of different lithologies, and the precipitation characteristics of carbonate rocks and evaporites were summarized to obtain the symbiotic sequence of carbonate rocks and evaporites.

[0014] Furthermore, the precipitation characteristics of carbonate rocks and evaporite rocks are specifically as follows: carbonate rocks are rocks formed by chemical precipitation produced by evaporation of evaporated concentrated seawater with a salinity exceeding 3.5%; evaporite rocks are rocks formed by chemical precipitation produced by evaporation of evaporated brine with a high salinity; the salinity of the evaporated brine used to prepare evaporite rocks exceeds 16%.

[0015] Furthermore, the paragenetic sequences of carbonate rocks and evaporites were identified based on the logging curves, and the types of mineral assemblage sequences were summarized on the logging curves. Specifically, based on the different performances of carbonate rocks and evaporites in natural gamma logging curves, sonic time difference logging curves and compensated density logging curves, limestone, dolomite, gypsum rock and salt rock were obtained; the logging characteristics of limestone are: low GR, low AC, DEN is about 2.7, Pe>4.5; the logging characteristics of dolomite are: low GR, low AC, DEN is about 2.8, Pe<4.5; the logging characteristics of gypsum rock are: low GR, low AC, high DEN, DEN>2.8; the logging characteristics of salt rock are: low GR, high AC, low DEN, DEN<2.5.

[0016] Furthermore, test wells were selected, and based on the logging curves and the types of carbonate and evaporite co-existing sequences, high-frequency cycle division of the evaporite-bearing strata was carried out for the test wells. Specifically, five-level high-frequency sequence division of the test wells was carried out based on natural gamma ray logging curves, sonic time difference logging curves and compensated density logging curves, thus completing the high-frequency cycle division of the evaporite-bearing strata based on logging.

[0017] Furthermore, based on the high-frequency cycle data of the test well, the cumulative deviation value of the high-frequency cycle thickness data is obtained, specifically: the high-frequency cycle thickness data is counted, the mean of the high-frequency cycle data is obtained based on the counted high-frequency cycle data, and the cycle thickness deviation and the cumulative thickness deviation are further obtained.

[0018] Furthermore, a Fischer diagram of the test well is drawn, specifically: based on the obtained cyclic thickness deviation and cumulative thickness deviation, the cumulative deviation corresponding to each cycle number is connected with the cycle number as the horizontal coordinate and the cumulative deviation as the vertical coordinate to obtain a Fischer diagram.

[0019] Furthermore, based on the Fischer diagram of the test well, the characteristic comparison data of the sea level fluctuation curve of the test well is obtained through the inflection point of the high-frequency cycle of the test well. Specifically, when an extreme value appears in the Fischer diagram, the inflection point of the high-frequency cycle is determined, and the division and comparison of the high-frequency cycle and the low-frequency cycle are realized to obtain the characteristic comparison data of the sea level fluctuation curve of the test well; at the same time, based on the high-frequency cycle division of the evaporite-bearing sequence of the well logging and the characteristic comparison data of the sea level fluctuation curve of the test well, the gypsum cycle division and sea level fluctuation reconstruction of the test well are completed.

[0020] The system for gypsum cycle division and sea level rise and fall reconstruction based on rock electrical response includes:

[0021] A first acquisition module, which acquires a paragenesis sequence of carbonate rocks and evaporite rocks based on a sequence of minerals precipitated from saline seawater;

[0022] An identification module, which identifies the paragenesis sequence of carbonate rocks and evaporites based on the well logging curves and summarizes the mineral combination sequence types on the well logging curves;

[0023] A high-frequency cycle division module, which performs high-frequency cycle division of evaporite-containing sequences on the test well based on well logging curves and carbonate and evaporite coexistence sequence types;

[0024] A drawing module, which obtains the accumulated deviation value of the high-frequency cycle data based on the high-frequency cycle data of the test well and draws a Fischer diagram of the test well;

[0025] The second acquisition module, based on the Fischer diagram of the test well, obtains the comparative data of the sea level rise and fall curve characteristics of the test well through the inflection points of the high-frequency cycles of the test well, and completes the gypsum cycle division and sea level rise and fall reconstruction of the test well.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention takes carbonate rock and gypsum-salt rock coexistence sequence as the object, takes seawater sedimentation salinization cycle as the guide, and uses logging rock electrical response characteristics to complete high-frequency cycle division and stratum comparison within a small area, providing high-resolution sequence stratigraphic work basic materials for the fine characterization, development law and reservoir prediction of inter-salt thin reservoirs. At the same time, the present invention realizes high-frequency cycle division of vertical strata, lateral comparison and closely related sea level reconstruction, which has a positive role in promoting the fine characterization, development law and reservoir prediction of inter-salt thin reservoirs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 It is a schematic diagram of the flow of the method for gypsum rock cycle division and sea level rise and fall reconstruction based on rock electrical response of the present invention;

[0030] Figure 2 It is a schematic diagram of the structure of the system for gypsum cycle division and sea level rise and fall reconstruction based on rock electrical response of the present invention;

[0031] Figure 3 This is a schematic diagram of the carbonate rock-gypsum rock logging deposition sequence of the present invention; wherein, Figure 3 (a) is a schematic diagram of limestone logging deposition; Figure 3 (b) is a schematic diagram of dolomite logging deposition; Figure 3 (c) is a schematic diagram of gypsum logging deposition; Figure 3 (d) is a schematic diagram of salt rock logging deposition;

[0032] Figure 4 (a) is the histogram of the five-level high-frequency cycles of Well Jin 10;

[0033] Figure 4 (b) is the histogram of the five-level high-frequency cycles of Well Jintan 1;

[0034] Figure 5 Prepare schematics for Fischer diagrams;

[0035] Figure 6 (a) is the sea level rise and fall curve of Jin 10 well;

[0036] Figure 6 (b) is the sea level rise and fall curve of Jintan 1 well;

[0037] Figure 7This is a comparison chart of the sea level rise and fall curve characteristics of Jin 10 Well and Jintan 1 Well. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0041] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0042] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0043] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0045] See also Figure 1 The present invention discloses a method for gypsum rock cycle division and sea level rise and fall reconstruction based on rock electrical response, including:

[0046] S101, based on the mineral sequence precipitated from saline seawater, obtain the paragenesis sequence of carbonate rocks and evaporites;

[0047] The saline seawater is concentrated and dried in turn to obtain carbonate rocks and evaporites of different lithologies. The precipitation characteristics of carbonate rocks and evaporites are summarized to obtain the symbiotic sequence of carbonate rocks and evaporites.

[0048] Carbonate rock is a rock formed by chemical precipitation produced by evaporation of concentrated seawater with a salinity of more than 3.5%; evaporite is a rock formed by chemical precipitation produced by evaporation of evaporated brine with a high salinity; the salinity of the evaporated brine used to prepare evaporite is more than 16%.

[0049] S102, identifying the paragenesis sequence of carbonate rocks and evaporites based on the well logging curves, and summarizing the mineral assemblage sequence types on the well logging curves;

[0050] Based on the different performances of carbonate rock and evaporite in natural gamma ray logging curves, sonic time difference logging curves and compensated density logging curves, limestone, dolomite, gypsum rock and salt rock are obtained; the logging characteristics of the limestone are: low GR, low AC, DEN is about 2.7, Pe>4.5; the logging characteristics of the dolomite are: low GR, low AC, DEN is about 2.8, Pe<4.5; the logging characteristics of the gypsum rock are: low GR, low AC, high DEN, DEN>2.8; the logging characteristics of the salt rock are: low GR, high AC, low DEN, DEN<2.5.

[0051] S103, selecting a test well, and dividing the high-frequency cycles of the evaporite-containing sequence of the test well based on the well logging curve and the carbonate rock and evaporite paragenesis sequence type;

[0052] Based on the natural gamma logging curve, sonic time difference logging curve and compensated density logging curve, the test well was divided into five levels of high-frequency sequences, and the high-frequency cycle division of evaporite-bearing sequences based on logging was completed.

[0053] S104, based on the high-frequency cycle data of the test well, obtaining a cumulative deviation value of the high-frequency cycle data, and drawing a Fischer diagram of the test well;

[0054] Counting the high-frequency cycle thickness data, obtaining the mean of the high-frequency cycle data based on the counted high-frequency cycle data, and further obtaining the cycle thickness deviation and the cumulative thickness deviation;

[0055] Based on the obtained cyclic thickness deviation and cumulative thickness deviation, the cumulative deviations corresponding to each cycle number are connected with the cycle number as the horizontal axis and the cumulative deviation as the vertical axis to obtain the Fischer diagram.

[0056] S105, based on the Fischer diagram of the test well, through the inflection point of the high-frequency cycle of the test well, obtain the comparative data of the sea level rise and fall curve characteristics of the test well, complete the gypsum cycle division and sea level rise and fall reconstruction of the test well.

[0057] When an extreme value appears in the Fischer diagram, the inflection point of the high-frequency cycle is determined, the division and comparison of high-frequency and low-frequency cycles are achieved, and the comparative data of the sea level fluctuation curve characteristics of the test well are obtained; at the same time, based on the high-frequency cycle division of the evaporite-bearing sequence of the logging and the comparative data of the sea level fluctuation curve characteristics of the test well, the gypsum cycle division and sea level fluctuation reconstruction of the test well are completed.

[0058] See also Figure 2 The present invention discloses a system for gypsum cycle division and sea level rise and fall reconstruction based on rock electrical response, comprising:

[0059] A first acquisition module, which acquires a paragenesis sequence of carbonate rocks and evaporite rocks based on a sequence of minerals precipitated from saline seawater;

[0060] An identification module, which identifies the paragenesis sequence of carbonate rocks and evaporites based on the well logging curves and summarizes the mineral combination sequence types on the well logging curves;

[0061] A high-frequency cycle division module, which performs high-frequency cycle division of evaporite-containing sequences on the test well based on well logging curves and carbonate and evaporite coexistence sequence types;

[0062] A drawing module, which obtains the accumulated deviation value of the high-frequency cycle data based on the high-frequency cycle data of the test well and draws a Fischer diagram of the test well;

[0063] The second acquisition module, based on the Fischer diagram of the test well, obtains the comparative data of the sea level rise and fall curve characteristics of the test well through the inflection points of the high-frequency cycles of the test well, and completes the gypsum cycle division and sea level rise and fall reconstruction of the test well.

[0064] Example:

[0065] The present invention discloses a method for gypsum rock cycle division and sea level rise and fall reconstruction based on rock electrical response, comprising:

[0066] Step 1: Based on the mineral sequence precipitated from saline seawater, the saline seawater is concentrated and dried in turn to obtain carbonate rocks and evaporites of different lithologies, and the precipitation characteristics of carbonate rocks and evaporites are summarized to obtain the symbiotic sequence of carbonate rocks and evaporites; the carbonate rock-evaporite symbiotic sequence in the study area, such as limestone (3.5% salinity, i.e. normal salinity seawater), dolomite (>3.5% salinity, evaporated concentrated seawater), gypsum (>16% salinity, evaporated brine), and salt rock (>26% salinity, evaporated brine), is summarized, as shown in Appendix 1.

[0067] Table 1 Characteristics of carbonate rocks and evaporites

[0068]

[0069] Step 2: Rock electrical characteristics matching, based on natural gamma logging curves, acoustic time difference logging curves and compensated density logging curves, carbonate rock and evaporite rock types are identified, and then the mineral combination sequence types are identified and summarized on the logging curves. Thin-layered and thick-layered dolomite-gypsum paragenesis sequence types are identified in the study area; Figure 3 As shown;

[0070] Step 3: Jin 10 Well and Jintan 1 Well in the study area were selected as comparative test wells. Natural gamma logging curves, acoustic time difference logging curves and compensated density logging curves were used to divide the five-level high-frequency sequence on the basis of the summary template of mineral combination sequence type, and the high-frequency cycle division of evaporite-bearing sequence based on logging was completed, such as Figure 4 As shown, Well Jin 10 is divided into 61 five-level high-frequency cycles, and Well Jintan 1 is divided into 62 five-level high-frequency cycles.

[0071] Step 4: Based on the high-frequency cycle division scheme of Jin 10 Well and Jin Tan 1 Well, collect and count the high-frequency cycle thickness data of Jin 10 Well and Jin Tan 1 Well, further calculate the average cycle thickness of Jin 10 Well and Jin Tan 1 Well, and calculate the cycle thickness deviation of Jin 10 Well and Jin Tan 1 Well. Deviation from cumulative thickness As shown in Table 2 and Table 3 respectively.

[0072] Table 2 Thickness deviation data of five-level high-frequency cycles in Jin 10 well

[0073]

[0074]

[0075] Table 3 Thickness deviation data of five-level high-frequency cycles in Jintan 1 well

[0076]

[0077]

[0078] Step 5: Use the accumulated deviation value, such as Figure 5 As shown, the Fischer diagrams of Jin 10 well and Jin Tan 1 well are drawn, as shown in Figure 6 (a) and Figure 6 (b). Among them, Figure 6 In (a), 1 is the fifth-order high-frequency cycle of Jin 10 Well, 2 is the fourth-order high-frequency cycle of Jin 10 Well, and 3 is the third-order low-frequency cycle of Jin 10 Well. Figure 6 In (b), 4 is the fifth-order high-frequency cycle of Jintan 1 well, 5 is the fourth-order high-frequency cycle of Jintan 1 well, and 6 is the third-order low-frequency cycle of Jintan 1 well.

[0079] Step 6: Through the Fischer diagram, it can be seen that six fourth-order high-frequency cycles and one third-order low-frequency cycle were identified in Well Jin 10 and Well Jin Tan 1 respectively; Figure 6 (a) and Figure 6 As shown in (b), the high-frequency and low-frequency cycles can be easily divided and compared through the inflection point of the high-frequency cycle, such as Figure 7 shown.

[0080] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for gypsum cycle division and sea level rise and fall reconstruction based on rock electrical response, characterized in that: include: Based on the mineral sequence precipitated from saline seawater, the paragenesis sequence of carbonate rocks and evaporites is obtained; Based on the well logging curve, the carbonate rock and evaporite paragenesis sequence is identified, and the mineral combination sequence type is summarized on the well logging curve; Select test wells, and divide the high-frequency cycles of evaporite-bearing sequences in the test wells based on the well logging curves and the types of carbonate and evaporite coexistence sequences; Based on the high-frequency cycle data of the test well, the cumulative deviation value of the high-frequency cycle data is obtained, and the Fischer diagram of the test well is drawn; Based on the Fischer diagram of the test well, the inflection point of the high-frequency cycle of the test well is used to obtain the comparative data of the sea level rise and fall curve characteristics of the test well, and the gypsum cycle division and sea level rise and fall reconstruction of the test well are completed.

2. The method for gypsum cycle division and sea level rise and fall reconstruction based on rock electrical response according to claim 1 is characterized in that: The symbiotic sequence of carbonate rock and evaporite is obtained based on the mineral sequence precipitated from saline seawater, specifically: The saline seawater is concentrated and dried in turn to obtain carbonate rocks and evaporites of different lithologies. The precipitation characteristics of carbonate rocks and evaporites are summarized to obtain the symbiotic sequence of carbonate rocks and evaporites.

3. The method for gypsum cycle division and sea level rise and fall reconstruction based on rock electrical response according to claim 2 is characterized in that: The precipitation characteristics of the carbonate rock and evaporite are specifically as follows: The carbonate rock is a rock formed by chemical precipitation produced by evaporation of concentrated seawater with a salinity exceeding 3.5%; the evaporite is a rock formed by chemical precipitation produced by evaporation of evaporated brine with a high salinity; the salinity of the evaporated brine used to prepare the evaporite is greater than 16%.

4. The method for gypsum cycle division and sea level rise and fall reconstruction based on rock electrical response according to claim 3 is characterized in that: The paragenesis sequence of carbonate rock and evaporite is identified based on the well logging curve, and the mineral combination sequence type is summarized on the well logging curve, specifically: Based on the different performances of carbonate rock and evaporite in natural gamma ray logging curves, sonic time difference logging curves and compensated density logging curves, limestone, dolomite, gypsum rock and salt rock are obtained; the logging characteristics of the limestone are: low GR, low AC, DEN is about 2.7, Pe>4.5; the logging characteristics of the dolomite are: low GR, low AC, DEN is about 2.8, Pe<4.5; the logging characteristics of the gypsum rock are: low GR, low AC, high DEN, DEN>2.8; the logging characteristics of the salt rock are: low GR, high AC, low DEN, DEN<2.

5.

5. The method for gypsum cycle division and sea level rise and fall reconstruction based on rock electrical response according to claim 4 is characterized in that: The test wells are selected, and based on the well logging curves and the types of carbonate and evaporite coexistence sequences, the high-frequency cycles of the evaporite sequences are divided for the test wells, specifically: Based on the natural gamma logging curve, sonic time difference logging curve and compensated density logging curve, the test well was divided into five levels of high-frequency sequences, and the high-frequency cycle division of evaporite-bearing sequences based on logging was completed.

6. The method for gypsum cycle division and sea level rise and fall reconstruction based on rock electrical response according to claim 5 is characterized in that: The high-frequency cycle data based on the test well is used to obtain the cumulative deviation value of the high-frequency cycle thickness data, specifically: The high-frequency cycle thickness data are counted, and the mean of the high-frequency cycle data is obtained based on the counted high-frequency cycle data, and the cycle thickness deviation and the cumulative thickness deviation are further obtained.

7. The method for gypsum cycle division and sea level rise and fall reconstruction based on rock electrical response according to claim 6 is characterized in that: The Fischer diagram for drawing the test well is specifically: Based on the obtained cyclic thickness deviation and cumulative thickness deviation, the cumulative deviations corresponding to each cycle number are connected with the cycle number as the horizontal axis and the cumulative deviation as the vertical axis to obtain the Fischer diagram.

8. The method for gypsum cycle division and sea level rise and fall reconstruction based on rock electrical response according to claim 7 is characterized in that: The Fischer diagram based on the test well obtains the comparative data of the sea level rise and fall curve characteristics of the test well through the inflection point of the high-frequency cycle of the test well, specifically: When an extreme value appears in the Fischer diagram, the inflection point of the high-frequency cycle is determined, the division and comparison of high-frequency and low-frequency cycles are achieved, and the comparative data of the sea level fluctuation curve characteristics of the test well are obtained; at the same time, based on the high-frequency cycle division of the evaporite-bearing sequence of the logging and the comparative data of the sea level fluctuation curve characteristics of the test well, the gypsum cycle division and sea level fluctuation reconstruction of the test well are completed.

9. A system for the division of gypsum cycles and reconstruction of sea level rise and fall based on rock electrical response, characterized in that: include: A first acquisition module, which acquires a paragenesis sequence of carbonate rocks and evaporite rocks based on a sequence of minerals precipitated from saline seawater; An identification module, which identifies the paragenesis sequence of carbonate rocks and evaporites based on the well logging curves and summarizes the mineral combination sequence types on the well logging curves; A high-frequency cycle division module, which performs high-frequency cycle division of evaporite-containing sequences on the test well based on the well logging curve and the carbonate rock and evaporite paragenesis sequence type; A drawing module, which obtains the accumulated deviation value of the high-frequency cycle data based on the high-frequency cycle data of the test well and draws a Fischer diagram of the test well; The second acquisition module, based on the Fischer diagram of the test well, obtains the comparative data of the sea level rise and fall curve characteristics of the test well through the inflection points of the high-frequency cycles of the test well, and completes the gypsum cycle division and sea level rise and fall reconstruction of the test well.

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