摘要
东濮凹陷北部深层存在明显的异常高压,欠压实作用和有机质热演化是主要的控制因素,相应地主要发育成岩高压和生烃高压2种类型的异常高压。成岩高压主要分布在深洼部位,其余分布在向深洼的过渡带;生烃高压分布范围广,除西部断阶带胡庆地区外,其他地区均有发育。异常高压对有机质热演化的抑制作用应具备4个条件,即压力达到门限压力、异常高压为早期成因、有机质类型较好和原始有机质丰度较高。东濮凹陷北部深层异常高压对有机质热演化具有抑制作用,尤其是早期形成的异常高压,抑制作用更为明显。通过门限压力、异常高压发育状况以及异常高压形成时期的综合分析,认为东濮凹陷北部深层有机质热演化受抑制的区域主要分布在东部洼陷和西部洼陷,其中东部洼陷分布较广。
It is indicated that the deep overpressures exits in the northern of Dongpu depression, the rapid deposition and hydrocarbon generation are the two key control factors which result in diagenetic overpressure and hydrocarbon generation overpressure separately. The diagenetic overpressure is mainly developed in the deep sag area and others in transitional zone. The hydrocarbon generation overpressure is developed in the whole depression except for Huqing area in western fault zone. It is pointed out that the constrain effect on the thermal evolution of organic matter has 4 conditions, which includes threshold overpressure, early developed overpressure, good organic matter type and high original TOC content. The early developed overpressure significantly inhibits the thermal evolution of organics in the north part of Dongpu depression. Based on analysis of threshold value, the distribution and forming period of overpressure, this paper predicts the target zones which are inhibited by deep overpressure in the north part of Dongpu depression.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2013年第3期33-36,113,共4页
Petroleum Geology and Recovery Efficiency
基金
国家科技重大专项"渤海湾盆地精细勘探关键技术"(2011ZX05006)
关键词
异常高压
成岩高压
生烃高压
抑制作用
有机质热演化
东濮凹陷
abnormal overpressure
diagenetic overpressure
hydrocarbon generation overpressure
constrain effect
thermal evolution of organic matter
Dongpu depression
