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Method and device for compiling paleotectonic map of exploration target stratum in hydrocarbon expulsion period

A paleostructural map and purpose technology, applied in the field of geological research, can solve the problem of inability to capture oil and gas, inaccurate description of paleostructural characteristics of exploration target layers during the hydrocarbon expulsion period, and inability to accurately reflect the relationship between the formation time of structural traps and the hydrocarbon expulsion period, etc. problems, to achieve the effect of improving the success rate of exploratory wells

Active Publication Date: 2022-01-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, for exploration deployment, most researchers only identify traps and deploy wells based on the current structural maps, and have not accurately described the paleostructural characteristics of the exploration target layers during the hydrocarbon expulsion period. However, one of the key elements of oil and gas structures That is, the matching relationship between the formation time of structural traps and the period of hydrocarbon expulsion. Only when the formation time of structural traps is earlier than or approximately equal to the period of hydrocarbon expulsion can it be possible to capture a large amount of oil and gas and then become a hydrocarbon-bearing structure.
If the late structure is developed or there is a late structural reversal in the study area, the structural traps on the current structural map may be formed after the hydrocarbon expulsion period. Although such structural traps have good trap conditions, they cannot capture oil and gas
Therefore, only based on the current structural map, it is impossible to accurately reflect the sequential relationship between the formation time of structural traps and the hydrocarbon expulsion period, which leads to a low success rate of drilling structural traps during exploration deployment.

Method used

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  • Method and device for compiling paleotectonic map of exploration target stratum in hydrocarbon expulsion period
  • Method and device for compiling paleotectonic map of exploration target stratum in hydrocarbon expulsion period
  • Method and device for compiling paleotectonic map of exploration target stratum in hydrocarbon expulsion period

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Embodiment 1

[0065] This embodiment provides a method for compiling a paleostructural map of the exploration target layer during the hydrocarbon expulsion period, the steps are as follows (such as figure 1 shown):

[0066] S11. Determine the hydrocarbon expulsion period (p) based on the analysis results of hydrocarbon expulsion curves of source rocks in the study area. In this example, the hydrocarbon generation indicators of the source rocks in the basin where an African oilfield is located are analyzed, and the depositional period of the Neogene J group is determined to be the hydrocarbon expulsion period (p) of the source rocks, see figure 2 .

[0067] S12. Determine the exploration target layer (t) based on the analysis results of the reservoir-caprock combination in the study area; Group Y is the exploration target layer (t), see figure 2 .

[0068] S13. Determine the hydrocarbon expulsion period and the geological horizon H corresponding to the exploration target layer through ...

Embodiment 2

[0074] This embodiment provides a device 400 for compiling paleostructural maps of exploration target layers during the hydrocarbon expulsion period, such as Figure 8 As shown, the device includes: an information loading unit 401, a hydrocarbon expulsion period determination unit 402, an exploration target layer determination unit 403, a seismic interpretation and slice grid generation unit 404, a bottom shape compensation depth grid (DB p) Calculation unit 405, paleostructural map level grid of exploration target layer during hydrocarbon expulsion period (DT p ) computing and graphing unit 406.

[0075] The information loading unit 401 is used to load source rock analysis data, well logging and seismic data to the analysis system. The hydrocarbon expulsion period determination unit 402 is used to determine the hydrocarbon expulsion period based on the source rock analysis data in the study area. The exploration target layer determination unit 403 is used to determine the e...

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Abstract

The invention provides a method and a device for compiling a paleotectonic map of an exploration target stratum in a hydrocarbon expulsion period. The method comprises the following steps: S11, determining a hydrocarbon expulsion period; S12, determining an exploration target layer; S13, determining an Hp geologic horizon and an Ht geologic horizon corresponding to the hydrocarbon expulsion period and the exploration target layer, and generating layer grids DHp and DHt of the geologic horizon Hp and the geologic horizon Ht; S14, determining a set of flooding mudstone Hp-f adjacent to the Hp geological horizon, and carrying out interpretation of the Hp-f geological horizon on the seismic data body of the flooding mudstone Hp-f; S15, calculating the bottom shape gradient of the Hp geologic horizon in the deposition period; S16, calculating a bottom shape compensation depth grid in the Hp geological horizon deposition period; and S17, obtaining a layer grid of the paleotectonic map of the exploration target stratum in the hydrocarbon expulsion period, thereby obtaining the paleotectonic map of the exploration target stratum in the hydrocarbon expulsion period.

Description

technical field [0001] The present invention relates to the technical field of geological research, in particular to a method and device for compiling a paleostructural map of an exploration target layer during a hydrocarbon expulsion period. Specifically, the present invention relates to a method and device for compiling a paleostructural map of an exploration target layer during a hydrocarbon expulsion period based on seismic data methods and devices. Background technique [0002] The structural map of the exploration target layer is the basic map for determining the structural development characteristics, identifying favorable drilling targets, and discovering oil and gas reservoirs, especially during the hydrocarbon expulsion period of the source rock. The paleostructural map of the exploration target layer directly affects the formation time of traps, oil and gas charging Note potential, and exploration success rate. Before the deployment of exploration, if the paleost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G01V1/28
CPCG01V1/301G01V1/282Y02A10/40
Inventor 杨丽莎陈彬滔赵伟白洁史忠生薛罗马轮王磊史江龙
Owner PETROCHINA CO LTD