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Method and device for predicting oil-gas effective reservoir in sandstone

A reservoir prediction and sandstone technology, applied in the field of petroleum exploration, can solve the problems of inaccurate prediction of sandstone reservoir boundary and unsatisfactory reservoir prediction.

Pending Publication Date: 2021-04-27
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0008] The purpose of the present invention is to provide a method and device for predicting effective reservoirs of oil and gas in sandstone, which is used to solve the problem that the existing reservoir prediction cannot meet the identification of sandstone pores, resulting in inaccurate prediction of sandstone reservoir boundaries

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  • Method and device for predicting oil-gas effective reservoir in sandstone
  • Method and device for predicting oil-gas effective reservoir in sandstone
  • Method and device for predicting oil-gas effective reservoir in sandstone

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Embodiment 1

[0035] The method for predicting effective oil and gas reservoirs in sandstone of the present invention firstly identifies the sandstone development area in the research area according to the root mean square amplitude attribute of the post-stack seismic data; Intersect with the P-wave impedance inversion body to obtain the porous sandstone lithology body; then obtain the amplitude attenuation gradient body of the porous sandstone according to the amplitude attenuation gradient body and the pore sandstone lithology body, and finally predict the effective reservoir according to the amplitude attenuation gradient body, Its process is as follows figure 1 shown.

[0036] In the following, the Paleozoic Shiqianfeng Formation channel sandstone in the HQ area is taken as the research area. The HQ area has 3D post-stack seismic data bodies and 4 wells that have been drilled, namely wells qg1, qg2, kai40, and kai17, all of which have GR , sonic time difference, density, resistivity an...

Embodiment 2

[0063] Compared with method embodiment 1, in step 2.4 of this embodiment, the Cube Processor seismic processing module of Geoscope software is used to screen the natural gamma frequency division inversion body, that is, the Logical algorithm is used to make the natural gamma inversion obtained in step 2.1 If the natural gamma value of the Shiqianfeng Formation in the evolution body is less than 90API, the data is 1, otherwise it is 0, and the sandstone lithology body of the Shiqianfeng Formation in the study area is obtained.

Embodiment 3

[0065] Compared with method embodiment 1, in step 2.4 of this embodiment, the Cube Processor seismic processing module of Geoscope software is used to analyze the compressional wave impedance volume of sandstone lithology, that is, to perform Logical calculation on the sandstone lithology compressional wave impedance volume, as follows: The longitudinal wave impedance value of Shiqianfeng Formation is 9800-12000g / cm 3 The data in the range of *m / s is 1, and the data beyond the range is 0, and finally the porous sandstone lithology body is obtained.

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Abstract

The invention relates to a method and device for predicting an oil-gas effective reservoir in sandstone. The method comprises the steps: recognizing a sandstone development region through the root-mean-square amplitude attribute of post-stack seismic data; recognizing pore sandstone development area with a certain pore scale in the sandstone development area through intersection inversion of natural gamma frequency division and longitudinal wave impedance, wherein the recognition precision is high; and finally carrying out oil-gas detection on the pore sandstone development area with a certain pore scale by utilizing the characteristics of low-frequency increase and high-frequency attenuation of the oil gas, and predicting the distribution area of the oil-gas effective sandstone, so that the distribution range of the sandstone oil-gas effective reservoir is finely described, sandstone porosity prediction from sandstone reservoir prediction is realized, oil and gas content detection is gradually deepened, and the prediction precision of sandstone oil and gas effective reservoirs is improved.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration, in particular to a method and device for predicting effective oil and gas reservoirs in sandstone. Background technique [0002] At present, sandstone reservoir prediction techniques mainly include three categories: seismic facies analysis, seismic attribute analysis and seismic inversion. Prediction of effective sandstone refers to the further prediction of porosity and oil-gas content of sandstone on the basis of sandstone prediction, so as to find oil-bearing sand bodies with certain storage space. "Research on Earthquake Prediction Technology for Effective Reservoirs of Beach Bar Sandstone in Qingnan Subsag" proposes that on the basis of signal separation and reconstruction technology to improve the resolution of seismic data in existing research, multiple parameters such as reservoir physical properties, electrical properties, and seismic attributes are used to establish and T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/624
Inventor 邓明霞段晓燕陈发亮朱志国唐颖褚铁梁全清王肯堂
Owner CHINA PETROLEUM & CHEM CORP
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