东营凹陷古近系超压顶界面分布特征及其影响因素  

Distribution of top of Paleogene overpressure system and its influencing factors in Dongying depression,Jiyang Basin,East China

作　　者：查明 汪旭东 曲江秀 陈中红 刘宏杰 邓婷婷 

机构地区：[1]中国石油大学地球科学与技术学院,山东青岛266580 [2]中海石油(中国)有限公司深圳分公司研究院,广东广州510240

出　　处：《中国石油大学学报（自然科学版）》2012年第3期20-25,共6页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家油气重大专项课题(2008ZX05001);国家自然科学基金项目(40802026)

摘　　要：对比分析利用实测压力和超压层段的测井响应特征两种方法研究超压顶界面的优缺点,认为后者具有更加坚实的理论基础,并采用该方法对东营凹陷古近系超压顶界面的分布特征及其影响因素进行研究。结果表明:古近系超压顶界面主要分布于沙三中亚段的厚层泥岩中,反映在地震层序上为T4与T6反射界面之间,表现出一定的'层控性'特征,其埋藏深度主要为2.4～2.8 km,在平面上表现为凹陷中心深而边缘浅的特征;超压顶界面之下的岩性为一套以深灰色泥岩、灰质泥岩及砂质泥岩为主的泥质岩组合,泥质岩的岩性构成及沉积速率在一定程度上控制了超压顶界面的层位分布,而抬升剥蚀、断裂活动及盐底辟作用是造成部分地区超压顶界面变浅的主要因素。Pressure measurement and logging response analysis are two common methods used to study the top of overpressure （TOO） in petroleum industry. Due to the more reliable theory basis, the latter was used to analyze the distribution and influencing factors of the Paleogene TOO in Dongying depression, Jiyang Basin. The results show that the Paleogene TOO is mainly restricted within the thick mudstones in the middle part of the third member of Shahejie formation and corresponds to the interval between T4 and T6 reflecting interfaces in seismic sequences, which suggests the feature of strata-controlled. The burial depth of this TOO ranges from 2. 4 km to 2.8 km and shallows from the central to the margin. Sedimentary rocks be- low the TOO are composed of dark grey mudstone, calcareous mudstone and sandy mudstone. The horizontal distribution of TOO is partly controlled by lithology and deposition rate of underlying argillaceous rock, while tectonic uplift and denudation, faulting movement as well as salt diapirsm are the primary causes of the shallowing of the TOO in certain areas.

关 键 词：超压顶界面 分布特征 影响因素 古近系 东营凹陷 

分 类 号：TE122.1[石油与天然气工程—油气勘探]