|Table of Contents|

Comprehensive Evaluation on the Sealing Ability of Mudstone Caprock in Meishan Formation of Qiongdongnan Basin(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2011年第02期
Page:
152-158
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Comprehensive Evaluation on the Sealing Ability of Mudstone Caprock in Meishan Formation of Qiongdongnan Basin
Author(s):
WANG Huan1; 2; WANG Qi1; 2; ZHANG Gong-cheng3; ZHANG Rui1; 2; HAO Le-wei1; 2; MA Xiao-feng1; 2
1. Key Laboratory of Petroleum Resource Research, Chinese Academy of Sciences, Lanzhou 730000,Gansu, China; 2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China; 3. Research Institute of China National Offshore Oil Corporation, Bei
Keywords:
Qiongdongnan Basin;  Meishan Formation;  caprock;  sealing ability;  displacement pressure;  comprehensive evaluation
PACS:
P587
DOI:
-
Abstract:
Based on the single well and sedimentary facies data, the mudstone caprock in Meishan Formation of Qiongdongnan Basin was comprehensively evaluated. The results showed that the lithology of caprock was mainly shallow-bathyal marine mudstone, and the caprock developed in northern uplift belt and central depression, and the lateral continuity was good. The macro parameters, which included the maximum single-layer thickness, cumulative thickness and sandy content, showed that high-quality mudstone distributed along the northwest-southeast direction. Based on the relationship between sonic interval transit time and the displacement pressure of observed rock sample, the difference of displacement pressure between sandstone in the first member of Sanya Formation and mudstone in Meishan Formation was calculated, and the microscopic evaluation was carried out. The results indicated that the characteristic of the difference of displacement pressure was high in the upland and low in the depression for single well. The parameters, which included lithology, sedimentary environment, the maximum single-layer thickness, cumulative thickness, sandy content and the difference of displacement pressure between reservoir and caprock, were evaluated with weight to comprehensively evaluate the sealing ability of mudstone caprock. The results revealed that the comprehensive quality of caprock in Meishan Formation changed regularly; the characteristics were low in the north depression and high in the central uplift belt and central depression; the sealing ability of mudstone caprock for the littoral facies sandbody developed around the northern uplift belt and turbidite sandbody developed around central depression was strong in Sanya Formation.

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Last Update: 2011-06-20