孔隙型碳酸盐岩储集层分类及主控因素:以伊拉克西古尔纳油田Mishrif组为例  

Classification and Main Controlling Factors of Porous Carbonate Reservoirs:A Case Study from Mishrif Formation,West Qurna Oilfield,Iraq

作　　者：孙晓伟[1] 郭睿[1] 田中元[1] 邓亚[1] 韩海英[1] 衣英杰[1] 徐振永[1] 陈良 黄彤飞 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油天然气勘探开发公司,北京100034

出　　处：《地质科技情报》2017年第3期150-155,共6页Geological Science and Technology Information

基　　金：中国石油天然气股份有限公司重大科技专项"中东地区碳酸盐岩油藏整体优化部署及提高采收率技术研究与应用"(11.2011E-2501.X.01)

摘　　要：通过岩心、薄片和压汞等资料的综合分析,划分并研究了伊拉克西古尔纳油田白垩系Mishrif组孔隙型碳酸盐岩储集层类型及特征,并从层序地层、沉积相和成岩作用角度分析了储层的主控因素和分布特点。研究结果表明:研究区储集层可以划分为高孔高渗型、高孔中渗型、高孔低渗型、中孔低渗型和低孔低渗型5种类型。由高孔高渗型到低孔低渗型储层中值压力和排驱压力依次升高,物性逐渐变差。储层类型受到层序地层、沉积相和成岩作用的控制。海侵体系域和早期高位体系域以低渗储层为主,最大海泛面时期发育低孔低渗型储层,晚期高位体系域发育高孔高渗型储层;开阔陆棚相多发育高孔低渗型储层,台地前缘斜坡相和开阔台地相发育中孔低渗型储层,台地边缘礁滩相能量高,发育高孔高渗型储层,局限台地相发育低孔低渗型储层;溶蚀作用对储层物性影响最大,从高孔高渗型储层到低孔低渗型储层,溶蚀作用逐渐减弱,孔渗性逐渐变差。The characteristics and classification of the Cretaceous Mishrif Formation in the West Quran Oil- field of Iraq were studied through comprehensive analysis of cores, thin sections and mercury intrusion. The main controlling factors and reservoir distributions were analyzed from the perspective of sequence stratigraphy, depositional facies and diagenesis. The reservoir can be divided into five types, high porosi- ty, high permeability type; high porosity, moderate permeability type; high porosity, low permeability type; moderate porosity, low permeability type; low porosity, low permeability type. The median pres- sure and displacement pressure of these five types are increasing, and the petrophysical property is getting worse. The reservoirs are controlled by sequence stratigraphy, depositional facies and diagenesis. Low- permeability reservoirs developed in the transgressive system tract and the early highstand system tract. Low porosity and low permeability reservoirs developed in the sea flooding surface, and high porosity and high permeability reservoirs developed in the late highstand system tract. High porosity and low permea- bility reservoirs developed in the open shelf facies, and moderate to low types of reservoirs developed in the platform foreslope facies and open platform facies. Platform margin reef and shoal facies have high energy and high porosity and high permeability reservoirs developed in them. Low porosity and low permeability reservoirs developed in restricted platform facies. Dissolution has the greatest impact on the reservoir petrophysical properties, and from the high-permeability reservoirs to the low-permeability reservoirs, the dissolution is gradually weakened, and the permeability is gradually decreased.

关 键 词：孔隙型碳酸盐岩 储集层分类 主控因素 西古尔纳 

分 类 号：P618.130.21[天文地球—矿床学]