川西北九龙山-剑阁地区珍珠冲段储层特征与主控因素探讨

运用铸体薄片镜下观察、物性分析、扫描电镜及X-衍射分析等,对川西北九龙山-剑阁地区珍珠冲段的储层特征进行了研究。结果表明,研究区珍珠冲段储层孔隙类型以粒内孔、粒(砾)间孔、晶间(溶)孔、晶洞以及裂缝为主。九龙山地区211个样品分析测试结果显示,珍珠冲段孔隙度最大值5.69%,最小值0.08%,均值1.63%,渗透率最大值517.98×10-3μm2,均值14.49×10-3μm2;剑阁地区38个测井解释数据显示,珍珠冲段孔隙度最大值7.8%,最小值0.1%,均值3.63%。研究区为裂缝-孔隙型储层,控制储层发育的主要因素是沉积作用、成岩作用和构造作用。压实作用是导致储层孔隙损失的主要因素,胶结作用是降低储层渗透率的重要因素,溶蚀作用是对储层发育贡献最大的建设性成岩作用。

Reservoir Characteristics and Main Controlling Factor of Zhenzhuchong Member of Jiulong Mountain and Jiange Area in Northwest of Sichuan Basin

The reservoir characteristics of Zhenzhuchong member in the Jiulong mountain and Jiange region in north- west parts of tile Sichuan Basin were studied through microscopy observation of cast thin sections and analysis of physical properties and scanning electron microscope and X-diffraction. The results show that pores in the Zhenzhu- chong member of the study area are mainly primary intragranular dissolution pores and intergranular pores and inter- crystal porosity and geode and fracture. Test analysis on the 211 samples of Jiulong mountain indicates the maximum porosityZhenzhuchong member is 5.69% and the minimum porosity 0.08% and the average porosity 1.63% and permeability the maximum value of 517.98×10^-3 μm^2 and the average value of 14.49X 10 ^-3μm^2. The 38 logging in- terpretation data from the Jiange area show Zhenzhuchong section maximum porosity of 7.8% and minimum 0. 1 % and mean 3.63%. The main factors controlling the reservoir quality is sedimentation,diagenesis and tectonism. Com- paction is the main factor causing the loss of reservoir pore. An important factor to reduce the reservoir permeability is cementation and dissolution is the largest contribution to reservoir development constructive diagenesis.