断—砂配置侧向分流输导油气的综合判别方法

Lateral migration hydrocarbon identification in fault-sand configuration

为了研究含油气盆地"下生上储"式生储盖组合中油气成藏规律,在分析断—砂配置侧向分流输导油气所需条件的基础上,通过研究断—砂配置垂向输导油气能力综合评价指数(T_d)与侧向分流输导油气能力综合评价指数(T_c)的比值与砂体中油气柱高度之间的关系,建立了一套综合判别断—砂配置侧向分流输导油气的方法。利用文中方法综合判别东营组断—砂配置油气输导结果表明:(1)南堡凹陷东营组67个已知断—砂配置侧向分流输导油气运移所需的最小T_c/T_d为1,若T_c/T_d值大于1,则断—砂配置侧向分流输导油气,反之则断—砂配置垂向输导油气。(2)NP1-5井东营组11个未知断—砂配置侧向分流输导油气的综合判别结果显示,1~6号和8号断—砂配置的T_c/T_d值均大于1,即断—砂配置侧向分流输导油气,有利于油气在砂体中聚集成藏,油气钻探为油层或油水同层;7号和9~11号断—砂配置的T_c/T_d值均小于1,即断—砂配置垂向输导油气,不利于油气在砂体中聚集成藏,钻探结果为干层。上述结果表明,利用文中方法判别南堡凹陷东营组断—砂配置油气输导情况是可行的。

Hydrocarbon accumulations have a law of the lower-generation and upper-accumulation sourcerock-reservoir-caprock pattern.Based on the analysis of influence factors,fault-sand configuration hydrocarbon vertical migration evaluation index(Tc)and fault-sand configuration hydrocarbon lateral migration evaluation index(Td)are obtained.Based on the relation between the ratio of the index Tcto the index Tdand hydrocarbon column height,an approach to identify fault-sand hydrocarbon lateral migration is established.This approach is used to the Dongying Formation,Nanpu Sag,and the following understandings are obtained:(1)For 67 known fault-sand configurations,the minimum Tc/Tdis 1.If Tc/Tdis greater than 1,it is a lateral migration,if not,vertical migration;(2)For 11 unknown fault-sand configurations at Well NP1-5,the Tc/Tdof the configurations 1-6 and 8 are greater than 1,so they are lateral migration,which are favorable for hydrocarbon accumulation.The Tc/Td of the configurations 7 and 9-11 are less than 1,they are vertical migration,which are not favorable for hydrocarbon accumulation.The latest drilling proves that the proposed approach is feasible and effective.