Method for identifying non-bright spot oil reservoir in third AVO bright spot characteristic reservoir stratum zone

A bright spot, oil reservoir technology, applied in seismology, measuring devices, instruments, etc. for logging records, can solve the problem of not establishing the corresponding relationship of the reservoir wave impedance model, and achieve the effect of reducing exploration risk and improving accuracy

Active Publication Date: 2017-07-21
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, none of the above methods established the corresponding relationship

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  • Method for identifying non-bright spot oil reservoir in third AVO bright spot characteristic reservoir stratum zone
  • Method for identifying non-bright spot oil reservoir in third AVO bright spot characteristic reservoir stratum zone
  • Method for identifying non-bright spot oil reservoir in third AVO bright spot characteristic reservoir stratum zone

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[0053] Example 1

[0054] The working area of ​​3D seismic data is 5.6km 2 , A1 exploratory well has been drilled, and well A1 has discovered oil reservoirs in three types of AVO "bright spots" characteristic reservoir areas. At most four sets of sand bodies are developed in the target layer of sand and mudstone thin interbeds in this work area. Forward modeling has confirmed that the seismic reflection waves on the top of the thin interbeds are interfered by the reflections of the thin interbeds to a relatively small extent, which makes the formation of a relatively high level on the top of the thin interbeds. Strong seismic reflection event axis. If the sand body on the top surface of the thin interbed contains oil, the difference in wave impedance between the upper and lower strata will increase, forming a "bright spot" feature event axis on the top surface; if the middle sand body in the thin interbed contains oil, the thin interbed contains oil The sandstone reservoir is di...

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Abstract

The invention discloses a method for identifying a non-bright spot oil reservoir in a third AVO bright spot characteristic reservoir stratum zone, and belongs to the technical field of oil exploration and development. In the method, seismic data and well data are comprehensive utilized, wave impedance models of different reservoir stratum numbers are established for forward simulation, the corresponding relationship between the reservoir stratum wave impedance model and the non-bright spot oil reservoir is determined, a forward data body of the non-bright spot oil reservoir is generated on the basis of the corresponding relationship, inversion parameters which are sensitive to the non-bright spot reservoir stratum are preferably selected out by means of a constraint sparse spike inversion algorithm, wave impedance inversion is applied to actual seismic data, and a reasonable seismic reservoir stratum prediction result is finally determined. According to the invention, forward and inversion combined prediction of the reservoir stratum is carried out, the prediction precision is improved, the exploration risk is reduced, and the method for identifying the non-bright spot oil reservoir is an effective means for predicting a lithologic oil reservoir stratum.

Description

technical field [0001] The invention relates to a method for identifying non-bright spot oil reservoirs in three types of AVO bright spot characteristic reservoir areas, and belongs to the technical field of petroleum exploration and development. Background technique [0002] In the three types of AVO "bright spot" characteristic reservoir areas, due to the shallow depth of reservoirs and weak compaction, sandstone reservoirs generally exhibit low density and low velocity characteristics, and mudstone caprocks generally exhibit high density and high speed characteristics. In the process of formation deposition, some reservoirs with pinch-out characteristics are often formed. If the overburden is in good condition and cooperates with the structure to form traps, when oil and gas migrate to this time, oil reservoirs can be formed. Because the reservoirs in the reservoir contain oil, the velocity, density, and P-wave impedance will be lower, which appear as "bright spots" with...

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Application Information

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IPC IPC(8): G01V1/40G01V1/28G01V1/30
CPCG01V1/282G01V1/306G01V1/40
Inventor 谢启王鹏飞岳欣欣黎腾刘焕李俨邢丽娟赵乾辰
Owner CHINA PETROLEUM & CHEM CORP
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