东海陆架盆地西湖凹陷油气成藏动力学  

RESEARCH ON THE HYDROCARBON ACCUMULATION DYNAMICS OF XIHU SAG, EAST CHINA SEA SHELF BASIN

作　　者：叶加仁[1] 顾惠荣[2] 贾健谊[2] 

机构地区：[1]中国地质大学 [2]中国石化上海海洋油气分公司

出　　处：《天然气工业》2005年第12期5-8,共4页Natural Gas Industry

基　　金：国家自然科学基金资助项目(40172051)部分成果。

摘　　要：采用静态描述与动态模拟相结合的方法,对西湖凹陷的流体动力场、生排烃史、油气运聚及成藏机制等油气成藏动力学特征进行了系统研究。研究表明,西湖凹陷不同构造单元具有各异的地下地温场和压力场特征;始新统平湖组具有厚度大、分布广、有机质丰度高、热成熟度高和生排烃强度大等特点,是凹陷内最重要的烃源岩层系;西湖凹陷曾发生2期重要的油气充注过程,其中第一期主要充注液态烃,第二期主要充注气态烃,渗透性砂岩层、断层及不整合面组成了凹陷内纵横向相互连通、有利于油气运聚的流体输导系统;西湖凹陷的油气成藏具有多期成藏、垂向运聚、近源成藏等特点,油气富集受多种因素的联合控制。The characteristics of hydrocarbon accumulation dynamics of Xihu sag in East China Sea shelf basin, such as fluid dynamical field, hydrocarbon generation and expulsion histories, and reservoiring mechanisms etc. are systematically studied by using the methods of static description and dynamical modeling. The result shows that the different tectonic subunits of Xihu sag are of various features of subsurface geothermal arid pressure regimes; with great thickness, widespread distribution, high organic matter abundance, high thermal maturity and great intensities of hydrocarbon generation arid expulsion, the Eocene Pinghu Formation is the most important source rock in the sag; two stages of hydrocarbon charging ever occurred in Xihu sag, the first stage was mainly filled by liquid hydrocarbon and the second stage was dominantly charged by gaseous hydrocarbon; the permeable sandstones, faults and unconformities constituted the fluid conduit system of connecting each other in lateral and vertical, which was favorable for hydrocarbon migration and accumulation. The hydrocarbon accumulation in the sag was characterized by multi-period, vertical migration and accumulation, and near-source reservoiring.

关 键 词：流体 动力场 生油层 排烃 油气藏形成 动力学 流体流动 西湖凹陷 

分 类 号：P618.13[天文地球—矿床学]