低孔渗油气富集区优质储层形成条件及相关问题

FORMING CONDITION OF HIGH-QUALITY RESERVOIR AND ITS RELATIVE PROBLEMS IN LOW POROSITY AND PERMEABILITY ENRICHMENT ZONE

低孔低渗 (孔隙度一般小于 1 2 % ,渗透率大多在 1× 1 0 - 3μm2左右 )性质的碎屑岩作为储层的油气藏是我国中西部地区稳定克拉通盆地或者叠合盆地中最主要的油气藏类型。但是 ,通过近几年的勘探实践发现 ,在低孔低渗含油气区中 ,仍有具优质储集层的高产油气藏存在。从优质储层的构造、沉积和成岩等几个方面讨论了这些优质储层的形成条件、阐述了描述和识别优势储层的原则和方法基础。认为储层的原始物质组成和结构是影响其物性特征的最关键因素、先天母质条件是优质储层之本源 。

Pertoleum accumulation of low porosity (is smaller than 12% in general)and permeability (in mostly is 1×10\+\{-3\} μm\+2 or so)of fragmental rock which becomes reservoir is the most primary types of pertoleum accumulations at stabilize cratonic basin or superposed basin in center and west areas of our country. However it find that there are many prolific oil and gas accumulations which have high\|quality reservoir sandstones in low porosity and permeability oil and gas zones by the recently exploration. The authors discuss the forming condition of the high\|quality reservoirs from the structure, sediment and diagensis of high\|quality reservoirs formation and enumerate much element. Expound the principle and method basis that describe and discriminate them. Authors believe that original composition and structure of reservoirs are the most crucial element which effect the feature of physical property, congenital provenance condition is ultimate source of high\|quality reservoir. It is important to explain their genetic from tectonic and deposit environmental condition.