浅谈非常规油气藏  

Reflections of unconventional petroleum accumulation

作　　者：黄丹[1,2] HUANG Dan(Xi'an Shiyou University,Xi'an Shanxi 710065,China;Changqing Oilfield Company,CNPC,Xi'an Shanxi 710018,China)

机构地区：[1]西安石油大学,陕西西安710065 [2]中国石油长庆油田分公司,陕西西安710018

出　　处：《石油化工应用》2018年第3期1-5,共5页Petrochemical Industry Application

基　　金：中国石油科技重大专项;项目编号:2016E-0509;长庆油田公司科技项目;项目编号:2017GSJH030212

摘　　要：在对比非常规油气与常规油气特征差异的基础上,以"连续"与"准连续"概念为线索,通过成藏基础条件和成藏特征分析,认为非常规油气藏是以"孤立式"-"准连续式"-"连续式"的混合状态在盆地中心、斜坡等位置甜点式聚集,连续与否,受孔隙结构及岩石润湿性影响。其主要特征为:源储合一或源外近储;浮力作用受限;初次运移或短距离二次运移;无明确清晰的圈闭边界;流体分异差,无明确的油水界面。分析认为,生烃增压是一个暂态(幕式)过程,其对油水没有分异作用,同时,由于纳米孔隙的存在,地层的非均质性变的更强,毛管力作为阻力更为明显,浮力作用由于孔隙结构的复杂化对油气运移的动力作用受到限制,因此,该类油气藏形成的最本质原因是储层孔隙结构和非均质条件的复杂化。By comparison of the difference between unconventional and conventional petroleum accumulation,this paper begins with the concepts of continuous hydrocarbon accumu-lation and quasi-continuous hydrocarbon accumulation,analysises the accumulation condi-tions and accumulation characteristics,and proposes that the unconventional oil and gas reservoir is"isolated"-"quasi-continuous"-"continuous"state in microcosmic which accumu-lation in sweet spot in the center and slope of the basin.Its main features are source and reservoir in one or source near reservoir.Buoyancy restriction,primary migration or short distance two migration,no clear trap boundary.Fluid without a clear interface.On the above base,this paper proposes that hydrocarbon-generating pressurization is a transient(episodic)process,which does not separation the water and oil.At the same time,with nano-sized diameter of pore-throats in reservoirs,the formation heterogeneity become stronger,capillary force as the resistance is more pronounced and buoyancy effect the dynamic role which is good for migration of oil and gas due to the complexity of the pore structure is constrainted.Therefore,continuous type oil and gas reservoir formation in the essential reason is the complication of pore structure and heterogeneity.

关 键 词：非常规油气 甜点式聚集 连续型油气藏 准连续型油气藏 

分 类 号：TE122.23[石油与天然气工程—油气勘探]