焉耆盆地含油气碎屑岩储层微裂缝隙特征及其影响因素分析

微裂缝隙是 (特 )低孔碎屑岩储层具有较好渗透能力的必要条件。焉耆盆地含油气碎屑岩储层构造裂缝具有平行层理面、缝宽微小、延伸短、宏观裂缝不发育、破裂的岩石没有发生相对位移错动、裂缝主要发育在刚性颗粒内部等特征。影响构造微裂缝发育的因素是 :所处的构造应力部位 ,岩石成分成熟度、粒度、压实程度和早期填隙物含量。储层非构造裂隙主要是压实作用的结果 ,主要发生在脆性的长石颗粒内 ,横向纵向分布范围广。由于早期微裂缝的存在可使油气运移的距离更远 ,在盆地的边缘、山前等具有良好储层的远离生油中心的地区 ,也可能会形成油气藏。同时在分析油气圈闭条件中应重视早期微裂缝因素。

Characteristics and analyses of the microfractures of the hydrocarbon-bearing detrital reservoir rock in Yanqi Basin, Xinjiang

The quality of the low porosity permeability mainly depends upon the development of microfractures. The microstructural fractures develop inside the rigid grains, have parallel plane of bedding, widen narrowly, and extend shortly. The factors which influence the microfractures are the structural position, compositional maturity, grain size, the quantity of cements as well as specific compaction. The micro nonstructural fissures mainy result from the compaction, developing inside the brittle feldspar grains and existing widely. The early microfractures made hydrocarbon migrate farther, resulting in hydrocarbon accumulation in the margin of basin as well as the foothill. Therefore, the research must be emphasized on the early microfractures while analysing hydrocarbon traps.