Reservoir and development characteristics of the Da'anzhai tight oil in Sichuan Basin,SW China

作     者：Yongjun Wang Min Tong Yuanhui Sun Yuanzhong Zhang Dawei Yuan 

作者机构：PetroChina Research Institute of Petroleum Exploration and DevelopmentBeijing100083China National Energy Tight Oil and Gas Research&Development CenterBeijing100083China College of Geophysics and Information EngineeringChina University of PetroleumBeijing102249China 

出 版 物：《Petroleum Research》 (石油研究（英文）)

年 卷 期：2019年第4卷第3期

页      面：212-226页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：supported by the project of the PetroChina Research Institute of Petroleum Exploration and Development(2016yj01) the National Science and Technology Major Project of China(No.2016ZX05046-003) 

主　　题：Tight oil Storage space type Pore structure Pore throat Effective porosity Movable fluid saturation Development potential Effective development mode Shell limestone Da'anzhai member Sichuan basin 

摘      要：The oil in the Jurassic Da anzhai reservoirs in the Sichuan Basin is unconventional tight oil,which accumulated in or near source rocks,and did not experience extensive migration in a large-scale long *** first submember,second submember and third submember of Da anzhai Member are dominated by shell limestone which is widely and continuously distributed,and are typical near-source lacustrine shell limestone tight *** lithology,multiple types of reservoir space and complicated pore structure are developed in these *** effective reservoir space mainly includes micro-pores and micro-fractures with strong fabric *** petrophysics experiment reveals that the average connected matrix porosity of tight oil reservoir in Jurassic Da anzhai Member is about 2.13%,lower than that of other tight oil reservoirs but higher than the average effective porosity(0.97%)from previous single alcohol-saturated *** to production performance data,the Da anzhai shell limestone reservoir is not a simple porous or fractured reservoir,but has complex porethroat-fracture association or storage-seepage *** the development of fossil shells controls the development of micro-fractures,fluids are difficult to enter into but easy to escape from the *** the pore-throat is fine,the sorting is poor and the displacement pressure is high,the movable fluid saturation and mercury ejection efficiency of the reservoir in the Da anzhai Member is only slightly lower than that of some storage-seepage modes,and higher than that of Oil-bearing Group 7 of Yanchang Formation in the Ordos *** reservoir in the Da anzhai Member is one of the few tight oil reservoirs with high natural *** tight oil in the shell limestone of the Da anzhai Member has great development potential,but its extensive and effective development also has some challenges,such as high seepage resistance of matrix and ineffective single development