Exploration methods for oil and gas reservoirs controlled by strike-slip faults

Abstract

The invention relates to the technical field of petroleum and natural gas exploration, and discloses an exploration method for oil and gas reservoirs controlled by strike-slip faults, including: describing the strike-slip structural form of the target area through three-dimensional seismic data, and finding specific reservoir-controlling parts in the strike-slip fault; Low-velocity, low-resistivity, and low-density body locations are used to determine deep hydrocarbon sources; further, through rock mineralogical analysis and geochemical means to confirm whether there is a deep heat source in the formation corresponding to the reservoir-controlling part obtained by S1; further, through surface exploration and combined with The well logging and logging data of the existing wells confirm that there are oil and gas shows in the parts with deep heat sources obtained by S3; finally, through the finite element stress analysis, the favorable oil and gas enrichment areas are determined. Through the above steps, the location of the oil and gas reservoir controlled by the target strike-slip fault can be accurately determined.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration, in particular to an exploration method for oil and gas reservoirs controlled by strike-slip faults. Background technique [0002] Strike-slip faults are faults in which the two plates of the fault move relatively horizontally along the strike. Its basic features are straight fault lines, steep sections and narrow fault zones, which can be divided into left-handed and right-handed. Strike-slip faults can be divided into large, medium and small strike-slip faults according to their cutting depth, strike-slip distance and oil and gas geological characteristics. The petroleum geology community has formed a complete set of standards on how to identify strike-slip faults: [0003] (1) Most of the cross-sections are slow up and steep down, close to upright in the deep part, and directly inserted into the basement; [0004] (2) Flower-like structure developed on the profile; [0005] (...

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Problems solved by technology

[0006] (4) Inconsistent stratum thickness, sedimentary facies and occurrence on both sides of the fault;

However, not all strike-slip faults have oil and gas shows. For example, the complete Tanlu fault has a wide range, and oil and gas reservoirs have only been found in some intervals such as the Bohai Bay Basin and Subei Basin; No oil and gas reservoirs found in the surrounding area

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