Identification method of sweet spot zone in lacustrine shale oil reservoir and its application: A case study of the Shahejie Formation in Dongying Sag,Bohai Bay Basin

Zhang Pengfei; Lu Shuangfang; Li Junqian; Xue Haitao; Li Wenbiao; Zhang Yu; Wang Siyuan; Feng Wenjun

doi:10.11743/ogg20190618

Views : 0 下载量: 225 CSCD: 16

Export
Share
Collection
Album

Identification method of sweet spot zone in lacustrine shale oil reservoir and its application: A case study of the Shahejie Formation in Dongying Sag,Bohai Bay Basin
Vol. 40, Issue 6, Pages: 1339-1350(2019)
Online First：28 December 2019，

Published：2019
DOI： 10.11743/ogg20190618
稿件说明：

移动端阅览

DOI：

Zhang Pengfei, Lu Shuangfang, Li Junqian, et al. Identification method of sweet spot zone in lacustrine shale oil reservoir and its application: A case study of the Shahejie Formation in Dongying Sag,Bohai Bay Basin[J]. 2019, 40(6): 1339-1350. DOI： 10.11743/ogg20190618.

摘要

页岩油有利目标区既是页岩油资源甜点区、物性甜点区，又是工程甜点区，因此寻找表征页岩油资源甜点、物性甜点及工程甜点的主地质参数，是建立页岩油有利区优选方法的关键。建立了一种基于主地质参数的页岩油有利区优选综合定量评价方法：①以游离油量、渗透率和杨氏模量为主地质参数并作为评价指标，建立权重评价值函数；②以主地质参数权重评价值乘积构建综合权重因子，确定页岩油勘探开发有利层、低效层和无效层综合权重因子分布范围；③确定页岩油勘探开发有利层系及有利区分布。将该方法应用于渤海湾盆地东营凹陷，评价了27口井沙河街组三段下亚段和沙河街组四段上亚段页岩油层系综合权重因子，预测出页岩油勘探开发有利层系及有利区分布范围，研究结果对东营凹陷页岩油勘探开发具有一定的参考意义。

Abstract

The favorable target zone of shale oil reservoir is the overlapping area of resource sweet spot

physical property sweet spot and engineering sweet spot.To find out the primary geological parameters that may be applied to characterize the three kinds of sweet spots is the key to identifying favorable shale oil target zones.In the study

we propose a comprehensive quantitative method to identify favorable shale oil target zones based on major geologic parameters.First

the primary geological parameters including free oil content

permeability and Young modulus are chosen to establish a weighting evaluation function.Second

a comprehensive weighting factor is constructed by using the weighting evaluation value of primary geological parameters

to define the distribution of comprehensive weighting factors of the favorable

low-efficiency and ineffective layers in shale oil exploration.Third

the favorable target layers and zones of shale oil is thereby mapped.The method has been successfully applied to evaluate the comprehensive weighting factors of the shale oil sequence in 27 wells in the lower sub-member of the 3rd member (Es

) and the upper sub-member of the 4th member (Es

) of the Shahejie Formation

Dongying Sag

Bohai Bay Basin

and to map favorable layers and zones for shale oil exploration.The result is of certain referential meaning to the exploration and development of shale oil in the Dongying Sag.