Prediction method and exploration method of geological sweet spots of reservoir of inter-salt shale series of strata

A prediction method and shale technology, applied in the field of petroleum exploration, can solve the problems of less research on shale oil sweet spot prediction methods, and achieve high practical value, good hydrocarbon source conditions, and excellent storage conditions

Inactive Publication Date: 2018-12-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Scholars at home and abroad have conducted in-depth research on shale petrological characteristics, reservoir characteristics, depositional environment, formation mechanism and enrichment conditions of shale oil and gas, but there are relatively few related studies on shale oil sweet spot prediction methods

Method used

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  • Prediction method and exploration method of geological sweet spots of reservoir of inter-salt shale series of strata
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  • Prediction method and exploration method of geological sweet spots of reservoir of inter-salt shale series of strata

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Submerged 3 in the south fault block of Wangchang structure 4 10 Rhythmic Layers

[0078] Potential 3 in the south fault block of Wangchang structure in Qianjiang Sag, Jianghan Basin 4 10 rhythm layers, the continuous effective shale thickness is 7-9m (such as figure 1 shown), the organic carbon (TOC) is 1.2-1.3% (such as figure 2 shown). According to the existing sweet spot evaluation method (that is, the method provided in Table 1), the predicted result is: the potential 3 4 The 10th rhythm layer is a non-dessert area. Therefore, although more than 10 wells have been drilled in this area over the years and penetrated 3 4 10 Rhythmic Layers, but nothing for Submerge 3 4 10 rhythm layers were tested for oil, so no exploration breakthrough was made.

[0079] Utilize the embodiment of the present invention to mine 3 fault blocks in the south of the Wangchang structure in the Qianjiang sag of the Jianghan Basin 4 10 Rhythmic layer inter-salt mud shale reservoir sw...

Embodiment 2

[0093] Submerged 3 in the north fault block of Wangchang structure 4 10 Rhythmic Layers

[0094] Utilizing the prediction method for the geological sweet spot of the inter-salt mud shale formation oil reservoir provided by the present invention, the latent potential of the north fault block of the Wangchang structure in the Qianjiang sag of the Jianghan Basin is predicted to be 3 4 The sweet spot of intersalt mud shale series oil reservoir in 10 rhythm layers. The prediction steps are as shown in Example 1 and will not be repeated here.

[0095] Drill verification

[0096] see Figure 9 , Well Wang 99 is structurally located in the northern fault block of the Wangchang anticline in the Qianjiang Sag of the Jianghan Basin, and is geographically located in the fourth team and the fourth team of Qianjin, Zhouji Farm, Qianjiang City, Hubei Province. The well is located in the "sweet spot" superposition area of ​​the 10th rhythm of the third submerged member and the 2nd and 6th...

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Abstract

The invention provides a prediction method and exploration method of geological sweet spots of a reservoir of inter-salt shale series of strata and relates to the field of petroleum survey. The prediction method comprises the following steps: sampling different shale series of strata in the inter-salt shale series of strata to determine the rocky lithofacies of the shale series of strata; samplingthe shale series of strata with the rocky lithofacies of dolomite to determine the content of organic carbon, vitrinite reflectance, porosity, permeability, flowable pore throat radius, density, structure, soundwave, flowable oil mass heat releasing hydrocarbon and oil saturability index, wherein the rocky lithofacies, hydrocarbon source condition, storage and gathering condition and oil containing characteristic are met; and obtaining the sweet spots of the reservoir of inter-salt shale series of strata and the positions thereof and comparing the prediction result with the exploration result, wherein the relative error is smaller than 20%. The method has relatively high prediction precision and high field practicality. The method applied to exploring the geological sweet spots of the reservoir of inter-salt shale series of strata has relatively excellent field practicality.

Description

technical field [0001] The invention relates to the field of petroleum exploration, and in particular to a prediction method and an exploration method for a geological sweet spot of an inter-salt mud shale reservoir. Background technique [0002] Shale oil refers to the thermogenic petroleum resources that exist in the shale formation mainly in the free state, supplemented by the adsorbed state and the dissolved state in the shale-dominated formation, including pores and fractures of mud shale of oil. Shale oil sweet spot refers to the relatively rich area of ​​shale oil that can be extracted under the current technical conditions. [0003] The "sweet spots" prediction of exploration target layers has always been an important technical task in oil and gas exploration and development. How to quickly and accurately find oil and gas "sweet spots", accurately deploy wells, increase the drilling rate of oil layers and oil and gas production, and reduce development costs are cruc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24G01N23/207G01N15/08
CPCG01N15/08G01N15/088G01N23/207G01N33/24
Inventor 杜小娟梁文华吴慕宁罗凯龙玉梅王自翔李乐
Owner CHINA PETROLEUM & CHEM CORP
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