川西南井研地区龙王庙组储层特征及主控因素

Reservoirs characteristics and main controlling factors of Longwangmiao Formation in Jingyan area, southwestern Sichuan Basin

王东,王海军,王莹,张小青

WANG Dong, WANG Haijun, WANG Ying, ZHANG Xiaoqing

中国石化西南油气分公司勘探开发研究院，四川 成都 610041

Research Institute of Exploration and Development, Southwest Oil and Gas Company, SINOPEC, Chengdu 610041, China

川西南井研地区海相具有良好的勘探前景，但目前储层发育控制因素和侧向封堵条件尚不明确。通过对钻井岩心、薄片观察及野外剖面实测，结合各类实验数据分析，开展井研地区龙王庙组储层特征研究，探讨优质储层发育主控因素，落实储层展布与侧向封堵性。研究表明：储层岩性以颗粒云岩为主，储集空间以粒间溶孔（针孔）、扩溶小孔洞为主，为中—低孔渗的孔隙￣孔洞型储层；沉积期微古地貌高部位的颗粒滩沉积是储层发育的基础，准同生溶蚀作用是相控储层发育的关键，表生岩溶作用为优质扩溶孔洞储层发育提供重要保障。颗粒滩纵横向分布不连续，为相控储层侧向封堵提供了条件，井研地区具备发育岩性圈闭的基础。

Marine facies in Jingyan area has good prospect for exploration. However, at present, the controlling factors of reservoir development and lateral sealing conditions are not clear. Through core observation, thin section observation of wells and field profile measurement, combined with various experimental analysis data, the reservoir characteristics of Longwangmiao Formation in Jingyan area are studied, the main controlling factors of high-quality reservoir development are discussed, and the reservoir distribution and lateral sealing are implemented. The research shows that: the reservoir rocks are mainly composed of granular dolomite, the reservoir spaces type are mainly intergranular dissolution pores (pinhole) and dissolved small pore, and the reservoir type is pore-hole composite with medium-low porosity and permeability. The grain shoal in the high position of micro paleogeomorphology in the sedimentary period is the basis of reservoir development, and the key of facies controlled reservoir development is penecontemporaneous dissolution, and the karstification of supergene period provides an important guarantee for the development of high-quality solution expansion pore reservoir. The vertical and horizontal distribution of grain shoal is discontinuous, which provides conditions for the lateral sealing of facies controlled reservoirs, and the Jingyan area has the foundation for the development of lithologic traps.

10.6056/dkyqt202201003