岩性油气藏形成的成藏指数  

Reservoir forming index for the lithological oil reservoir.

作　　者：王宁[1] 陈宝宁[1] 翟剑飞[1] 

机构地区：[1]胜利石油管理局地质科学研究院

出　　处：《石油勘探与开发》2000年第6期2-5,8,共5页Petroleum Exploration and Development

摘　　要：岩性油气藏的形成是成藏动力 (即剩余围岩压力 )与成藏阻力共同作用的结果 ,只有在前者大于后者的条件被满足时才可能成藏。根据对东营凹陷岩性油气藏成藏条件的分析和大量测试数据统计结果 ,将压汞实验中进汞 50 %时所对应的排驱压力定义为等效排烃压力 ,用于定量评价油气初次运移进入岩性圈闭的阻力大小。等效排烃压力的大小主要与储集层的孔隙度和渗透率相关 ,根据东营凹陷 12 82块压汞测试样品的统计结果 ,得出根据孔隙度、渗透率计算等效排烃压力的相关公式。成藏指数是成藏动力与成藏阻力之比的无因次量 ,其值越大越利于砂体形成岩性油气藏 ,越小越不利于成藏。给出应用等效排烃压力和成藏指数评价东营凹陷牛庄地区两个沙三中亚段砂岩透镜体岩性圈闭的实例。钻探结果证实 ,等效排烃压力和成藏指数是定量评价砂岩透镜体成藏条件的有效参数 ,对油气勘探具有指导意义。图 2表 1参 6(王孝陵摘 )The formation of a lithological reservoir is the result of mutual action of reservoir forming power and reservoir forming resistance. Only if the action of the former larger than the later, a lithological oil reservoir can be formed. According to the results of analysis of reservoir forming conditions of lithological oil reservoir and statistical results of large amount of testing data in Dongying sag, the pressure corresponding to 50% of Hg-injection was taken as equivalent hydrocarbon displacement pressure to evaluate the resistance of primary migration of oil and gas into the lithological trap quantitatively. Equivalent displacement pressure obtained by the results of Hg-injection test on 1282 core samples in this sag is correlated to their porosity and permeability to derive an empirical formula. Reservoir forming index is defined as a non-dimensional parameter of the ratio of reservoir forming power over the reservoir forming resistance. The larger this index, the more favorable to the reservoir forming, conversely, the less this index, the worse to the reservoir forming. Two examples are given showing the forming of lithological oil reservoir in lenticular sand bodies in the middle of Member Es 3 in Niuzhuang area of Dongying sag. Results of exploration by drilling show that equivalent displacement pressure and index for reservoir forming are effective parameters to quantitatively evaluating the forming of oil reservoir in lenticular sand bodies, and can be taken as a guidance in petroleum exploration.

关 键 词：岩性油气藏形成 成藏指数 成藏动力系统 

分 类 号：TE122.31[石油与天然气工程—油气勘探] P618.130.2[天文地球—矿床学]