Direct oil and gas identification method for complex small fault blocks in the first section of the hole
An identification method and fault block technology, applied in seismology, instruments, measuring devices, etc., can solve problems such as unsatisfactory effects, and achieve high reliability, good application effects, and huge economic and social benefits
Active Publication Date: 2019-01-11
CHINA PETROLEUM & CHEM CORP +1
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[0003] In order to reasonably predict the oil layer distribution and oil-water contact position, attribute extraction and seismic inversion methods have been tried, but the results are not satisfactory. Preliminary analysis believes that the reason is that both attribute extraction and seismic inversion need to be established on reasonable seismic horizons on the basis of traceability and accurate structural interpretation, which precisely requires understanding whether changes in seismic signatures are due to reservoirs or geological
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[0029] In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments are listed below and shown in the accompanying drawings in detail as follows.
[0030] Such as figure 1 as shown, figure 1 It is a flow chart of the method for directly identifying oil and gas in a complex small fault block of the present invention.
[0031] In step 101, fine structure interpretation research is carried out, based on the characteristics of small and fragmented fault blocks in Weibei Oilfield. First of all, on the basis of single well calibration, joint well calibration was carried out to achieve consistent horizon calibration in the whole work area and avoid the occurrence of layer channeling in the process of horizon tracking. At the same time, due to some relatively hidden faults with short extension and small fault throws, the seismic reflections are dislocated or twisted on the seismic section, and the simil...
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The invention provides a method for oil and gas direct identification of a complex small fault block in a first member, comprising the following steps of 1, performing fine structural interpretation, using well-seismic combination, correlation analysis and multiple sets of seismic interactive verification to finely confirm the structure and improve the accuracy of structural interpretation; 2, based on seismic data, establishing six different forward geologic models with the combination of the acoustic data and VSP data of a study area to simulate the seismic response characteristics in different situations with different fault displacements and different upper and lower wall velocity intervals; 3, based on the step 2, summarizing the reflection characteristics and regularities of the oil-bearing blocks on the seismic profile, and conducting the prediction of oil and gas, and establishing the seismic reflection feature to directly discriminate the fault block reservoirs in the first member. The method for oil and gas direct identification of the complex small fault block in the first member is highly reliable, and good in application effect.
Description
technical field [0001] The invention relates to the technical field of oilfield development, in particular to a method for directly identifying oil and gas in a complex small fault block in a section of a hole. Background technique [0002] Weibei Oilfield is located in Weibei Sag, Changwei Depression, Bohai Bay Basin. It is a small rift-type faulted basin dominated by Eocene sediments in the Lower Tertiary. A large number of faults are developed in the central fault zone, and the fault throw is generally less than 150 meters. The particularity of the evolution of the sag determines the structural pattern of "one depression, two belts and one slope", which are the northern sag belt, the eastern Zaohu fault nose belt, the western Wacheng fault terrace belt and the southern slope belt. The Kongdian Formation, Shahejie Formation, Guantao Formation and Minghuazhen Formation are developed in this area. Vertically, the oil and gas are mainly concentrated in the Kongdian Formation...
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IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/624G01V2210/65
Inventor 陈东梁书义郭勤涛尚刚王传忠史翠娥赵蒙于尧祝永英蒋建亮王会丽支乐菲朱文敏罗小萍
Owner CHINA PETROLEUM & CHEM CORP