十屋断陷下白垩统营城组储层物性特征及评价

Reservoir Physical Properties and Evaluation of Lower Cretaceous Yingcheng Formation in the Shiwu Depression

十屋断陷营城组发育的扇三角洲前缘砂体是研究区主要的储层砂体,其砂岩主要为富杂基、富岩屑的长石岩屑砂岩和岩屑长石砂岩,砂岩成分成熟度低,结构成熟度中等到较低。(铸体)薄片、压汞资料分析表明,该区营城组储层属于低孔低渗致密性储层,以次生溶孔为主,以Ⅱ、Ⅲ、Ⅳ类储层为主,Ⅰ类储层较少。

The sand bodies of the fan delta front are the main sandstone reservoirs of the Yingcheng formation in the Shiwu depression. The sand bodies are consisted of feldspar sandstone debris with abundant impurity and debris. The compositional maturity is low and textural maturity is low to moderate. The analyses of capillary pressure curves and （cast） thin section indicates that the reservoir of Yingcheng formation has low porosity and low permeability. The main type of pores is the secondary porosity. The result of the successive research indicate that the types of reservoir in Yingcheng formation are mainly of Ⅱ Ⅲand Ⅳ, and the. Ⅰ type of reservoir only has a little.