网毯式油气成藏体系仓储层运移机理研究  

Study on Oil Migration Mechanism in Storage Layer of Meshwork-Carpet Type Hydrocarbon Reservoir System

作　　者：张善文[1] 王永诗[2] 姜素华[3] 王志英[2] 

机构地区：[1]中石化胜利油田分公司,山东东营257000 [2]中石化胜利油田分公司地质科学研究院,山东东营257015 [3]中国海洋大学海洋地球科学学院,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2009年第3期476-482,共7页Periodical of Ocean University of China

基　　金："十五"国家重大科技攻关项目"济阳坳陷隐蔽油藏地质评价和勘探关键技术研究"(2003BA613A)资助

摘　　要：研究网毯式油气成藏体系仓储层运移油的机理,揭示断层幕式排烃期仓储层运移油的机理,以油气二次运移理论为指导,开展了油沿断裂纵向运移及油在仓储层内横向运移的定量研究。首先根据地质模型,建立断层内油压力衰减梯度的数学模型,根据能量守恒原理,推导出油沿断层纵向运移的压力梯度公式,计算出油沿断裂进入仓储层的初始压力,再根据仓储层的地质模型,建立油在仓储层内横向运移的压力衰减模型及上网层开启时的泄压模型,推导出油沿仓储层横向运移的压力梯度公式及泄压公式,最终得出仓储层运移油的合力公式。并指出当运移动力大于运移阻力,即运移合力为正时,仓储层以运移油为主,当运移动力等于或小于运移阻力,即运移合力为负时,仓储层以临时仓储(成毯)、成藏为主。通过对运移合力的计算,可以判断油在仓储层内运移、成毯和成藏的状态,预测仓储层运移、成毯或成藏的范围,从而指导该体系隐蔽油气藏的勘探。In order to study the oil migration mechanism of storage layer in meshwork-carpet type hydrocarbon reservoir system and reveal lateral migration law of oil in storage layer during episodic hydrocarbon expulsion period, the quantitative study of oil migration along faults and in storage layers is developed with the guidance of secondary hydrocarbon migration theory. Establishing mathematical model of pressure gradient in faults on the basis of geological model, the pressure gradient formula is deduced according to energy conservation principle and the initial pressure of oil can be calculated accordingly; then building oil lateral migration pressure gradient model and pressure relief model based on different geological models of storage layer, the pressure gradient formula of oil lateral migration in storage layer and pressure relief formula are also deduced; finally the migration resultant force formula is obtained. The formula shows that oil is primarily migrating in storage layer when the resultant force is up to driving force which is larger than migration resistance, but contrary to temporary storage or pool forming. The condition and range of oil migration, carpet-forming or pool-forming in storage layer can be judged by calculating migration resultant force, so as to guild the exploration of subtle reservoirs effectively.

关 键 词：仓储层 运移动力 运移阻力 网毯式油气成藏体系 沾化凹陷 

分 类 号：TE112[石油与天然气工程—油气勘探]