湖北宜昌早奥陶世生物礁储层特征及控制因素

Reservoir Characteristics and Genesis of Lower Ordovician Reefs in Yichang, Hubei Province

湖北宜昌早奥陶世生物礁储层孔隙发育，类型多样，主要有骨架孔、生物体腔孔、溶蚀孔和微孔隙等８种类型。物性分析表明，礁体储层物性较差，以低孔低渗为特点，导致这种储集物性的原因一方面与礁体沉积特征有关，另一方面与胶结作用、压实作用等破坏性成岩作用的改造有关。探讨了礁体储层成因与构造埋藏史、有机质演化史和孔隙演化史的关系及成藏机理。

The porosity of lower Ordovician reefs in Yichang, Hubei province was developed commonly and have different types,such as skeletal pore,solution pore,micropore, etc. Rocks of reef reservoirs are characterized by low porosity low permeability based on the analysis of porosity and permeability. The petrophysical properties of the rocks result from both sedimentary environment and destructive diagenesis including cementation and compaction destroying strongly their primary pores. The origin of reef reservoir and its relationship with burial structural, organic and porosity evolutions histories and pool forming mechanism have been studied