A method for fault zone identification
An identification method and fault zone technology, which is applied in the field of oil and gas geophysics, can solve problems such as failure to meet fault zone identification requirements, single prediction results, and post-stack fracture detection technology that does not fully combine waveforms, etc.
Active Publication Date: 2021-12-24
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0004] The existing post-stack fracture detection technology does not fully combine information such as waveform, amplitude, dip and azimuth, the prediction results are single and mostly linear, and a single algorithm cannot meet the needs of fault zone identification
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[0053] The present invention will be further described below in conjunction with accompanying drawing. In this way, the realization process of how the present invention uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. It should be noted that, as long as there is no conflict, the technical features mentioned in the various embodiments can be combined in any manner. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
[0054] The invention provides a method for identifying a fault zone, comprising the following steps:
[0055] Step 1: Preparation of original seismic data volume, including preparation of pre-stack time migration data volume or pre-stack depth migration data volume;
[0056] Step 2: Perform fine preprocessing on the original seismic data volume;
[0057] Step 3: Using the p...
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The invention relates to a fault zone identification method, which comprises the following steps: step 1: preparing the original seismic data volume; step 2: performing fine preprocessing; step 3: calculating the structural guiding body; step 4: calculating the edge detection data volume; step 5 : Obtain the fault enhancement data volume; Step 6: Calculate the seismic gradient structure tensor eigenvalue data volume and obtain the eigenvalue data volume representing the chaotic reflection characteristics of the fault zone; Step 7: Obtain the fault zone structure data volume; Step 8: Enhance the fault zone The data volume and the fault zone structure data volume are fused to obtain the fault zone prediction result. The present invention fuses fault enhancement attribute data and fault zone structure attribute data, and finally obtains attribute data that can reflect both the external contour of the fault zone and the internal characteristics of the fault zone, providing a technical method and process for fault zone prediction, and has further popularization and application value.
Description
technical field [0001] The invention belongs to the field of oil and gas geophysics, and in particular relates to a fault identification method, in particular to a strike-slip fault zone identification method. Background technique [0002] In recent years, more and more oil and gas have been discovered in fractured reservoirs, and the reserves have continued to expand. The exploration of fractured reservoirs has received widespread attention. Accurate fracture prediction results are crucial for drilling and subsequent development. At present, many relatively mature seismic detection methods for fractured reservoirs have been developed at home and abroad, such as post-stack seismic fracture prediction methods: mainly including three-dimensional coherence volume, mutation or fractal dimension, dip scanning technology, three-dimensional variance volume, spectral decomposition, Multi-scale edge detection, etc.; using 3D wide-azimuth seismic data to carry out fracture prediction ...
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IPC IPC(8): G01V1/30G01V1/34
CPCG01V1/306G01V1/345G01V2210/624G01V2210/74
Inventor 马永强柯兰梅胡玮
Owner CHINA PETROLEUM & CHEM CORP