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Weathering crust reservoir bottom interface identification method based on mathematical statistics

An identification method and mathematical statistics technology, applied in geophysical measurement, seismic signal processing, measurement devices, etc., can solve the problems of few weathering crust reservoir top-bottom interface methods, etc., and achieve excellent feasibility and reliability.

Inactive Publication Date: 2021-09-24
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

Many scholars have divided the granite weathering crust reservoir vertically, and proposed some statistical division methods, but there are few studies on the method of calibrating the top-bottom interface of the weathering crust reservoir in the study area from the horizontal direction

Method used

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  • Weathering crust reservoir bottom interface identification method based on mathematical statistics
  • Weathering crust reservoir bottom interface identification method based on mathematical statistics
  • Weathering crust reservoir bottom interface identification method based on mathematical statistics

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Embodiment 1

[0028] Please refer to figure 1 As shown, a method for identifying the bottom interface of weathering crust reservoirs based on mathematical statistics includes the following steps:

[0029] Step 1: Construct a petrophysical model based on well data.

[0030] The petrophysical model is a wedge-shaped model, and the wedge-shaped model is established with the strongly weathered zone and the moderately weathered zone as the weathered crust reservoir that can become the storage space, the cap rock as the sand-mudstone reservoir, and the tight granite as the bedrock .

[0031] Step 2. Using the seismic forward modeling method to study and determine the relationship between the granite weathering crust reservoirs with different thicknesses and the seismic response.

[0032] The seismic forward modeling method refers to obtaining stacked sections through forward modeling of the wave equation, and simulating the response of weathering crust reservoirs with different thicknesses on t...

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Abstract

The invention relates to the technical field of reservoir bottom interface identification, in particular to a weathering crust reservoir bottom interface identification method based on mathematical statistics. The method comprises the following steps: S1, constructing a rock physical model on the basis of well data; S2, determining the relation between granite weathering crust reservoirs with different thicknesses and seismic response; S3, determining the ancient landform of the granite buried hill through an impression method research, selecting different exposure time points on an ancient landform map, counting the relative time difference between the top and bottom interfaces of a weathering crust reservoir stratum corresponding to different exposure time points on a seismic section, and carrying out multi-point fitting analysis by taking forward modeling as a reference to obtain a corresponding quantitative relational expression; and S4, taking the top interface of the whole-region weathering crust reservoir as input to obtain a calibration result of the bottom interface of the whole-region weathering crust reservoir and a quantitative result map of the time thickness of the weathering crust reservoir. The method is excellent in feasibility and reliability, and a good thought and method are provided for delineation work of the weathering crust of the granite buried hill.

Description

technical field [0001] The invention relates to the technical field of reservoir bottom interface identification, in particular to a method for identifying the bottom interface of a weathering crust reservoir based on mathematical statistics. Background technique [0002] Ancient buried hill oil and gas reservoirs have good development prospects and great potential for exploration and development, and are widely distributed in my country's Bohai Bay Basin, East China Sea Basin, Pearl River Mouth Basin, Qiongdongnan Basin, South China Sea Beibu Gulf Basin, and Liaohe Basin. Pre-Paleogene granite weathering crusts are generally developed in the Songnan Low Uplift and its periphery in the deep-water area of ​​the Qiongdongnan Basin. Drilling results show that the basement buried hill weathering crusts in this area are rich in oil and gas. The seismic response of the interface is messy, and it is difficult to calibrate the top and bottom of the reservoir, and the calibration of ...

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 蒋旭东曹俊兴王兴建许汉卿陈秋旭
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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