Seismic facies control-based sedimentary microfacies recognition method

A technology of sedimentary microfacies and identification methods, which is applied in the field of geophysical exploration to achieve the effect of improving resolution

Active Publication Date: 2017-09-01
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

This method solves the problem of beach bar microfacies prediction and identification for wells without drilling and coring data, but the Bayes discriminant function of bar sa

Method used

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  • Seismic facies control-based sedimentary microfacies recognition method
  • Seismic facies control-based sedimentary microfacies recognition method
  • Seismic facies control-based sedimentary microfacies recognition method

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Embodiment 1

[0064] Sedimentary microfacies identification method under the control of seismic facies in this embodiment (flow process is as follows figure 1 shown), including the following steps:

[0065] 1) Establish a seismic work area, input 3D seismic data, well data and drilling geological stratification data of the strata in the study area (requires strata to be studied);

[0066] 2) Normalize the logging data to eliminate the influence of different years, different logging instrument models, and different scales on the logging curve; the specific method is as follows:

[0067] ① Within the study area, select a well with complete logging data and a good correspondence between formation lithology and logging curve as a standard well, such as figure 2 As shown in , select well W2 as the standard well;

[0068] ② Carry out histogram analysis on the curve value range of standard wells and other wells, and analyze the value range distribution of standard intervals, such as figure 2 ...

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Abstract

The present invention relates to a seismic facies control-based sedimentary microfacies recognition method. The method includes the following steps that: 1) logging information is normalized; 2) fine horizon calibration is performed; 3) a model framework is determined; 4) a low frequency model is established; 5) a seismic data impedance value and a formation reflection coefficient are obtained, if synthetic trace data are in optimal matching with an actual seismic data trace, and drilling impedance is in optimal matching with seismic data impedance, and the method shifts to step 6), otherwise, the method shifts to the step 3); 6) well seismic constraint inversion is performed, a wave impedance inversion data body is obtained; 7) the top and bottom of a reservoir are traced and explained, with the top reflection layer and bottom reflection layer of the reservoir adopted as control surfaces, interlayer attributes are extracted from the inversion data body; and 8) seismic attributes are utilized to constrain the boundaries of sedimentary microfacies, and the spread of the sedimentary microfacies is described. According to the method, the logging information is adopted to constrain seismic inversion, and therefore, the resolution of an inversion result can be improved, the sedimentary microfacies of a target interval can be well depicted, the planar distribution of a thin sand layer can be predicted, and a basis can be provided for well location deployment.

Description

technical field [0001] The invention belongs to the technical field of special attribute processing and reservoir prediction in the technical field of geophysical exploration, and specifically relates to a sedimentary microfacies identification method under the control of seismic facies. Background technique [0002] With the deepening of oil and gas exploration and development, in recent years, oil reservoirs have been drilled in geological bodies such as turbidite sand bodies, sheet sands, and beach bar sands in negative structural belts. Target. Because the deep sag area and the inner slope are the confluence of multiple sand bodies, the reservoir is thin, and it is difficult to predict the thin sand layer. The traditional reservoir prediction technology cannot effectively describe the sedimentary microfacies distribution of the thin sand layer. [0003] Sedimentary microfacies refers to the smallest unit with unique rock structure, structure, thickness, rhythm and other...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/30G01V1/40
CPCG01V1/282G01V1/306G01V1/40G01V2210/6161G01V2210/6169G01V2210/62
Inventor 张永华杨云飞严移胜林社卿严永新刘桂兰王冶刘俊青李丽娟朱颜张帆
Owner CHINA PETROLEUM & CHEM CORP
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