|Table of Contents|

Comprehensive Evaluation on the Sealing Ability of Mudstone Cap Rock in Member 2 of Yinggehai Formation of Yinggehai Basin(PDF)

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

Issue:
2011年第04期
Page:
373-377
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Comprehensive Evaluation on the Sealing Ability of Mudstone Cap Rock in Member 2 of Yinggehai Formation of Yinggehai Basin
Author(s):
FENG Chong1; HUANG Zhi-long1; TONG Chuan-xin2; ZHU Jian-cheng2; FAN Hong-che1; LIU Jiang-tao3
1. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China; 2. Zhanjiang Branch Company, China National Offshore Oil Corporation, Zhanjiang 524057, Guangdong, China; 3. Research Institute of Petrole
Keywords:
displacement pressure;  mudstone;  cap rock;  gas;  sealing ability;  the second member of Yinggehai Formation;  Yinggehai Basin
PACS:
TE122;P618.13
DOI:
-
Abstract:
Through measuring the displacement pressure of mudstone cap rock in member 2 of Yinggehai Formation of Yinggehai Basin, the linear relation between displacement pressure of cap rock and acoustic time was demonstrated, and the method to calculate the displacement pressure with acoustic time and seismic velocity data was put forward to. Then, based on acoustic time and seismic velocity data, the overpressure distribution of mudstone cap rock in the lower of member 2 of Yinggehai Formation was determined by means of equivalent depth method. Considering the cap rock thickness, displacement pressure, overpressure, pressure of the gas reservoir, the damage of fracture to cap rock and the characteristic of gas(such as flow viscosity), the comprehensive index to evaluate the sealing ability of cap rock was put forward to, and was applied in member 2 of Yinggehai Formation. The results showed that the area with the best sealing ability of cap rock included most part of Ledong District, southern part of Lingao District and the region between eastern part of Dongfang District and No.1 fracture; the area with the better sealing ability included southern part of No.1 fracture, eastern and southern parts of Dongfang District; the sealing ability of cap rock in the edge of studied area gradually deceased because the formation exposed on the surface. Cap rock with the sealing ability above middle level could be considered as the effective one; according to the distribution of gas reservoir, the sealing ability of mudstone cap rock in member 2 of Yinggehai Formation and the sealing condition of gas reservoir in middle-deep layer were favorable.

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Last Update: 2011-12-20