安塞油田长 10_1储层成岩作用及岩相研究

安塞油田G52井区长10_1储层属低孔、中低渗-低渗储层，孔喉以中、细喉为主，具有粒度较粗，成分成熟度低，结构成熟度较高的特点。运用铸体薄片、X衍射、电镜扫描、镜质体反射率测定及物性分析等资料，研究了其成岩作用特征，确定成岩阶段主要处于中成岩的A期中亚期-B期。依据成岩作用类型及储层物性特征，划分出7种成岩相，其中强溶蚀成岩相和溶蚀成岩相孔隙度高、渗透率好、含油性好，是研究区最有利的油气储集相带；长石溶蚀一绿泥石膜胶结成岩相物性次之．含油性较差；压实固结成岩相、粘土矿物胶结成岩相、致密胶结成岩相和胶结成岩相物性最差，不利于油气储集。

Study on the diagenesis and diagenetic facies of Chang 10_1 reservoir in Ansai Oilfield

The Chang10_1 reservoir in Ansai Oilfield belongs to low porosity and middle -low permeability reservoir. The pore throats ,which are mainly small -middle pore throats ,were characterized by coarser granularity ,lower compositional ma- turity, and higher textural maturity. Based on the data of casting slice, X ray diffraction, scanning electron microscope, vitrinite reflectance and physical property analysis, we studied the diagenetic characteristics of Chang10_1 reservoir, and determined that the diagenetic stage of the reservoir is mainly the subage period of the diagenetic stage A and the diagenetic stage B. Ac- cording to diagenesis patterns and reservoir physical property characteristics, the reservoir was classified into seven kinds of diagenetic facies. Among them, the strong corrosion facies and corrosion facies having high porosity and permeability, and good oil - bearing property are the most beneficial reservoir facies, the feldspar corrosion - chlorite cementation facies with worse oil - bearing property come second, the compaction - consolidation facies, clay mineral cementation facies, dense ce- mentation facies and cementation facies with the worst physical property,are unfavourable to the hydrocarbon accumulation.