论油气聚集网

Discussion on hydrocarbon accumulation network

深化油气成藏规律认识对难度越来越大的常规和非常规油气藏勘探具有重要理论和现实意义。在油气聚集圈和油气聚集链等认识基础上,结合渤海湾盆地冀中、黄骅坳陷以及酒泉盆地等地区勘探实践,提出了“油气聚集网”这一概念。研究认为,油气成藏与分布具有网络状展布的特征,即在一套烃源岩发育的油气成藏系统中,同类油气藏横向并列形成油气聚集圈,不同类型油气藏纵向有序排列形成油气聚集链,油气聚集圈与油气聚集链相互交织形成了由盆地中心向盆地边缘放射状展布的油气聚集网;构造控制圈层和优势运移通道,圈层决定储层特征、成藏机理及油气藏类型,优势运移通道约束油气聚集链,构造是控制油气聚集网的根本原因;提出了基于油气聚集网的勘探思路,即依据圈层确定油气藏类型,依据优势通道和沉积体系进一步确定油气藏的位置和规模。并基于油气聚集网认识,总结了成藏要素耦合模型与油气藏分布模式,提出了油气聚集网络结点油气藏预测方法。

Deepening the understanding on hydrocarbon accumulation laws is of important theoretical and practical significances for the increasingly difficult exploration of conventional and unconventional reservoirs.Based on the understandings on hydrocarbon accumulation circle and hydrocarbon accumulation chain,the reservoir-forming laws of hydrocarbon accumulation network are proposed in combination with the exploration practices in Jizhong and Huanghua depressions of Bohai Bay Basin and Jiuquan Basin.Studies suggest that hydrocarbon accumulation and distribution have the characteristics of network-like spread,namely,in a hydrocarbon accumulation system developed by a set of source rocks,congeneric reservoirs tend to be juxtaposed horizontally to form hydrocarbon accumulation circles,different types of reservoirs show an ordered arrangement vertically to form hydrocarbon accumulation chains,and hydrocarbon accumulation circles and chains are intertwined,forming an hydrocarbon accumulation network that spreads radially from the center to the margin of the basin;tectonics control the circle and dominant migration pathway,and the circle determines the reservoir characteristics,reservoir-forming mechanism and reservoir types;the dominant migration pathway constrains the hydrocarbon accumulation chain,and the tectonics is the fundamental reason controlling the hydrocarbon accumulation network;additionally,a hydrocarbon accumulation network-based exploration idea is put forward,i.e.,the type of reservoir can be clarified according to the circle,and the location and scale of the reservoir can be further determined according to the dominant pathway and sedimentary system.Based on the understanding on the hydrocarbon accumulation network,the coupling model of accumulation elements and the distribution model of hydrocarbon reservoirs are summarized,and the hydrocarbon accumulation network coordinates-oriented reservoir prediction method is proposed.