47 results about "Sequence stratigraphy" patented technology

The invention discloses a multiple-stratum-series tight sandstone gas reservoir well spacing method. The method includes the following steps that first, based on high-resolution sequence stratigraphy, distribution of sand bodies is depicted, an effective reservoir stratum is predicted through the earthquake and well logging technology, and an enrichment region is preferentially selected; second, based on a favorable region, a longitudinal structure of the sand bodies is fine dissected through the geology and well logging technology, and therefore the horizontal distribution law of the sand bodies can be researched; third, in the preferential favorable region, well spacing is performed according to conditions. The well spacing method is reasonable and takes the complex geology that multiple gas-bearing series longitudinally develop in an upper palaeozoic tight sandstone gas reservoir, the single layer yield is low and the lateral variety of the reservoir stratum is fast into consideration, the drilling success of a development well can be guaranteed, the development effect can be improved to the maximum extent, and the economical and effective development of the tight sandstone gas reservoir is achieved.

The invention provides a method and device for determining a sedimentary stratum ancient landform. The method comprises the steps that objective horizon obtained in advance is divided according to the third-order sequence division mode in the sequence stratigraphy theory, and a sequence stratigraphic framework of the objective horizon is built to determine the studying sequence; the horizon, in accordance with the preset requirements, in the studying sequence is selected as restoring horizon; the thickness of the restoring horizon is obtained according to the top boundary and the bottom boundary of the restoring horizon; decompaction treatment is performed on the thickness of the restoring horizon to determine the original sedimentary thickness; the sedimentary stratum ancient landform is determined according to the mirror-image relationship between the original sedimentary thickness and the ancient landform. According to the method and device for determining the sedimentary stratum ancient landform, the condition that a denudation phenomenon may exist in the objective horizon is considered, the sequence stratigraphic division is performed on the objective horizon, a selection method of the restoring horizon is discussed under the constraint of the sequence stratigraphy theory to obtain the accurate stratum thickness used for ancient landform restoring, and therefore the accuracy of ancient landform restoring is improved.

The invention discloses a method for predicting the plane distribution law of the effective natural fissures of an oil reservoir and belongs to the field of natural fissure research. The method comprises the following steps: according to the conventional fissure recognition and description technologies, preliminarily determining the characteristic parameters of the natural fissures of the ultra-permeability dense oil reservoir; acquiring the preliminary distribution law of the natural fissures according to the finite element method; according to the characteristic parameters and the preliminary distribution law, building a reservoir-bed fissure geologic model; according to the sequence stratigraphy and the phase-controlled modeling technology, building a reservoir bed matrix geologic model; according to development conditions of the natural fissures in different matrixes, combining the reservoir bed fissure geologic model and the reservoir bed matrix geologic model and building a preliminary reservoir bed geologic model taking the natural fissures into consideration; on the basis of the preliminary reservoir bed geologic model taking the natural fissures into consideration, acquiring the plane distribution law of the effective natural fissures by adjusting the characteristic parameters to be fitted with production data. The method provides a reliable basis for optimizing a development technology policy.

The invention provides a method for exquisitely depicting and predicting edge structures of carbonate platforms. The method comprises the steps of: establishing a high-resolution sequence stratigraphic framework through well-seismic combination; recovering an ancient landform according to a stratum residual thickness map and determining a development position of a platform edge; exquisitely dissecting the platform edge by utilizing seismic data, establishing development modes of different platform edge zones at different periods, and analyzing a development issue and a superposition style of areef flat body; determining plane distribution characteristics of the platform edge and development issue and scale of the reef flat body therein, and delimiting a beneficial reef flat development zone of the platform edge zone; and forwardly modeling the growth of a platform by using geological software, and optimizing a prediction result. The method for exquisitely depicting and predicting edgestructures of carbonate platforms is mainly based on a sedimentology theory and a sequence stratum theory, and is capable of carrying out exquisite dissection on platform edge structures and predicting distribution positions beneficial for reef flat bodies by sufficiently utilizing outcrop, seismic and drilling data, thereby improving the exquisite degree of platform structure depiction.

The invention discloses an oil reservoir division and comparison method based on high resolution sequence stratigraphy. The oil reservoir division and comparison method comprises the steps of: identifying medium-term base level cycles based on rock cores, drilling/logging seismic data, high resolution sequence stratigraphy, base level cycles and an admissible space change principle, by means of the change trend of an A/S value; dividing and comparing oil groups by interfaces and flooding surfaces of the identified medium-term base level cycles; based on the drilling/logging seismic data, the flooding surface and conversion surface of the change of a reference surface, identifying short-term base level cycles, and dividing and comparing sand groups; according to the identified superposed modes of short-term base level cycles, establishing an isochronous stratigraphic framework by means of comparison; and according to the stratigraphic framework, controlling division and comparison small layers under the control of the cycle and stratum superposed modes. The oil groups, the sand groups and the small layers are included in an oil reservoir division and comparison unit. According to the invention, the oil reservoir division and comparison method solves the problem in the prior art that a diachronous phenomenon usually occurs in the comparison process.

The invention provides an identification method of a sedimentary microfacies mode of a carbonate rock high-frequency sequence framework. The method includes the following steps: determining a lithologic sensitive well logging curve by using a layer rock core sample of carbonate rock and a conventional well logging curve; determining a three-porosity well logging curve combination according to a resistivity well logging curve combination; identifying a low-frequency sequence boundary according to the lithologic sensitive well logging curve, the three-porosity well logging curve combination and the resistivity well logging curve combination; identifying a high-frequency sequence boundary according to the low-frequency sequence boundary; analyzing single well sedimentary subfacies and microfacies division; and completing the comparison and division of sedimentary microfacies of a whole well section. The method has strong operationality, conforms to the principles of sequence stratigraphy and sedimentology, can accurately establish the sedimentary microfacies mode with the high-frequency sequence as constraint with dynamic and static combination of division units, carries out sedimentary evolution analysis, and lays a good foundation for the sedimentary understanding of carbonate gas reservoir, the establishment of reservoir geophysical prediction forward model and the comprehensive evaluation of gas reservoirs.

The invention relates to a method for compiling a paleogeologic map of carbonate rock strata based on the sequence stratigraphy, which comprises the steps of performing division calibration on sequence strata on the basis of basic data information, building carbonate connected well profile sequence stratigraphic framework and spatial sequence stratigraphic framework, analyzing the mutual superimposition relation of different strata on the profile and spatial development characteristics and distribution rules, specifying the mode and sequence structure of rhythmic strata of carbonate rocks, anddelimiting the structural boundary and range; taking a stratum thickness map as a base map, drawing stratum boundaries corresponding to different sequence stratigraphic interfaces according to the stratigraphic superimposition relation from old to new; and then correcting the stratigraphic boundaries according to the special geological phenomenon interpreted by the existing data, supplementing map elements and thus completing the drawing of the paleogeologic map. The method not only can ensure the accuracy of geological information, but also can guide the actual exploration and development more effectively, thus reducing the risk of exploration and development, and reducing the cost input of th exploration and development.

The invention relates to a comprehensive evaluation method for single well petroleum geology. The method comprises the following steps: 1, source rock evaluation; 2, reservoir stratum evaluation; 3, overlying stratum evaluation; 4, entrapment evaluation; 5, oil gas source comparison. According to the comprehensive evaluation method for the single well oil gas geology, the sequence stratigraphy theory serves as guidance, systematic observation of rock debris and the core and sample analysis serve as the bases, physical geography materials such as logging are combined, system partitioned strata are compared with adjoining wells, target stratum series sedimentary facies markers, sedimentary facies types and characteristics, stratigraphic sequence characteristics and sedimentary cycles, structures and structural characteristics are researched, sedimentary facies, cored interval sedimentary microfacies and comprehensive logging interval sedimentary microfacies are partitioned, sedimentary environment analysis is conducted, a single well facies model and whole well sedimentary facies sections are established, the mutual relations between the sedimentary facies and a crude stratum, a reservoir stratum and an overlying stratum are defined, and outlining basis is provided for conducting single well oil gas geology basic element analysis.

The invention provides a method used for characterizing a small and medium sized extension rift basin growth reverse fault, which belongs to the technical field of geological prospecting. The method comprises the steps that the data of an area to be identified are collected and processed; sequence division is carried out under the guidance of a sequence stratigraphy theory, and an isochronal sequence stratigraphic framework of the area to be identified is established; under the constraint of the isochronal sequence stratigraphic framework of the area to be identified, construction-stratigraphic linkage interpretation is carried out, and positive and reverse faults are identified and classified; stratigraphic-sedimentary linkage interpretation is carried out on classified positive and reverse faults; a pseudo fault which is mistakenly identified is rejected, and a fault framework of the area to be identified is established; construction-sedimentary linkage interpretation is carried out on positive and reverse faults in the fault framework of the area to be identified; a growth fault construction framework is established, and a growth reverse fault in the framework is determined; a tectonic geologic model of the growth reverse fault and the derivative tectonic geologic model are built; and the cause of the growth reverse fault in each tectonic geologic model is analyzed to guide oil and gas exploration of the area to be identified.

The invention discloses a method for finely restoring karst paleogeomorphology in the technical field of paleogeomorphology restoration. The specific steps of the method for finely restoring karst paleogeomorphology are as follows: S1: Find a relatively accurate representative paleosea in the overlying stratum of ancient weathering crust Plane stratigraphic depositional interface; S2: Obtain the relative height of the topography on the weathering crust through the stratum thickness between the depositional interface and the weathering crust; S3: Use the method of high-resolution sequence stratigraphy to calculate the relative height of the topography in step S2 S4: Construct the seismic profile; S5: Analyze the seismic profile features on the seismic profile, and restore the karst ancient landform. The restoration image of the karst ancient landform in the present invention is intuitive and realistic, with low cost and easy Realized that the restoration of ancient landforms is relatively complete, and at the same time, the impact of the later structure of the landforms is considered, and the restoration accuracy is high.

The invention discloses a fine-grained sediment outcrop researching method. The method comprises the following steps: 1) selecting a standard profile; 2) using a sequence stratigraphy principle to determine a stratigraphic framework, and taking standard entity fossil as a basis to establish the age stratigraphic framework; 3) continuously sampling by a system; 4) polishing the sample, describing composition, structure and construction of a black mudstone lamina, 5) developing a characteristic analysis on a reservoir of the black mudstone; and 6) developing rock mechanics and stress sensitivityanalysis of the black mudstone. The fine-grained sediment outcrop researching method uses outcrop data, establishes the stratigraphic framework of the fine-grained sediment, can symptom characteristic of the fine-grained sediment and the rock mechanical property, and provides the basis for evaluating the resource potential of the black mudstone and shale gas exploitation.

The invention relates to an isochronal interface recovery method in the last phase of mid-term deposition cycle of the fluvial facies stratum. The method comprises the following steps that 1) an undercutting sign is identified, and an undercutting position of a post river is determined; 2) the undercutting depth of the post river is obtained; and 3) an isochronal stratum interface in last phase of mid-term deposition cycle is recovered. According to the invention, the undercutting position of the post river is identified according to logging and earthquake integrated response and sand body growth characteristics by taking a reference surface cycle theory in high-resolution sequence stratigraphy as guidance, an identification result is objective and reasonable, and and the multiplicity of solutions is reduced.

The invention relates to a quantitative evaluation method for the quantity of potential resources around a developed oil field, wherein the method comprises the following steps: a, analyzing the development rule of a reservoir around the developed oil field based on a high-resolution sequence stratigraphy evolution rule, and locking a favorable reservoir development position; b, searching for a seismic reflection interface corresponding to a medium-term cycle reference surface adjacent to the favorable reservoir development position depth, carrying out horizon interpretation, searching for potential sand bodies, and numbering the potential sand bodies; c, carrying out multi-factor analysis on the potential sand bodies, evaluating each potential sand body, and defining a potential reserve unit; and d, determining reserve calculation parameters of the potential reserve unit, and calculating the reserve of the potential sand bodies. The method can be widely applied to potential sand bodyreserve calculation of developed surrounding oil fields of offshore oil fields, and further exploration and development of the offshore oil fields are facilitated.

The invention discloses a quantitative recovery method for a carbonate rock stratum sedimentary micro-landform based on a high-frequency cycle, and relates to the technical field of ancient landform recovery. According to the method, sequence stratigraphy is taken as a theoretical basis, basic data information is fully applied, a spectrum analysis technology and a multi-scale matching method are adopted, an earthquake-logging sequence stratigraphic framework is established, sequence stratigraphic interface types and development characteristics are analyzed, isochronous geologic bodies are determined, and high-frequency cycle combination types and characteristics are acquired. Therefore, quantitative recovery of the carbonate rock stratum sedimentary micro-landform is achieved, the scale and precision of the sedimentary landform can be improved, powerful support is provided for deepening geological understanding and the next exploration direction, and then exploration risks and cost input are reduced.

The invention discloses a high-precision seismic sequence division method. The method comprises the following steps: S01, carrying out fine calibration on synthetic records; S02, obtaining a seismic inversion data volume; S03, performing high-precision seismic sequence division; and S04, predicting a favorable reservoir development area. The method has advantages that a problem that seismic sequence division cannot be carried out due to insufficient resolution of conventional seismic data is solved by using seismic inversion data, high-precision seismic sequence division method research is carried out in combination with seismic sequence stratigraphy, a favorable reservoir development area is searched in each sedimentary cycle, and a direction is pointed out for searching oil and gas resources.

The invention discloses a fracture development degree characterization method, which comprises the following steps that: a high-resolution sequence stratigraphy method is adopted to determine the calculation step length of fracture strength, and the value of the calculation step length is a sedimentary cycle thickness similar to seismic data identification accuracy; crack basic parameters comprising the number of cracks and crack inclination angles are acquired; the crack linear density and the crack apparent cutting ratio are quantitatively calculated through a fixed step length and windowingmethod, the crack linear density is the ratio of the number of cracks in the calculation step length to the calculation step length, and the crack apparent cutting ratio is the ratio of the sum of tangent values of crack inclination angles in the calculation step length to the calculation step length; and the fracture development degree of the single-well coring well section is characterized according to the fracture linear density and the fracture apparent cutting ratio. On the basis of research of a high-resolution sequence stratigraphy method, the definition of the linear length in the fracture linear density is perfected by clearly calculating the step length, and the fracture development degree difference caused by the fracture inclination angle difference is solved by adopting fracture apparent cutting ratio quantitative characterization.