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城壕地区西259井区长3段储层特征研究
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摘要
本文以钻井、测井资料为基础,通过岩心观察、铸体薄片、扫描电镜、图像粒度、常规压汞、相渗曲线等实验方法和技术,结合区域地质背景、沉积条件和成岩特征,对城壕地区西259井区长3段储层进行了系统的研究,着重分析、探讨了该区储层的沉积微相、岩石学、物性及孔隙结构特征,并从沉积作用和成岩作用上对研究区长3段的储集性能进行了探讨,主要取得了以下认识:
     (1)研究区长3段沉积相主要表现出湖泊三角洲前缘亚相,在平面上基本上呈带状展布,发育有水下分流河道、河口坝和分流间湾等沉积微相。
     (2)研究区长3段储层的岩性主要以岩屑质长石砂岩为主,成分成熟度低,结构成熟度中等,多为次圆到次棱角状,分选中等-好。填隙物主要由自生粘土矿物和碳酸盐矿物胶结物组成。胶结类型主要为孔隙-薄膜式胶结,少数为薄膜-孔隙式胶结。
     (3)研究区长3段储层属低孔、特低渗储集,主要储集空间为残余粒间孔为主,其次为溶蚀孔。研究区砂岩储层喉道类型以片状喉道及弯片状喉道为主,其次为缩颈型喉道和管束状喉道,孔隙之间连通性较差。孔隙结构表现出细-中孔的孔隙结构。
     (4)研究区长3段的成岩作用类型主要有压实作用、胶结作用和溶蚀作用,其次为交代作用和破裂作用。其中压实作用和胶结作用,这是导致储层有效孔隙度和渗透率偏低的主要原因之一;溶蚀作用改善储层物性起到积极作用。
     (5)研究区长3储层储集性能主要受沉积作用和成岩作用控制。沉积时水动力较弱,岩石粒度以细砂、极细砂为主,成分成熟度偏低、结构成熟度中等,这是造成储层低孔、低渗的主要原因。
In this paper, the reservoir microfacies, petrology, physical properties and pore structure characteristics of Chang-3 member reservoir in Xi-259 well area of Chenghao have maken a systematic research, which based on drilling and logging datas, with the core observation and the techniques of casting section, SEM, pore image, conventional pressure mercury, and relative permeability curve experimental. At the same time, reservoir properties have been discussed from the perspective of sedimentation and diagenesis. The conclusions go as following:
     (1) The Sedimentary facies of Chang-3 member reservoir in Xi-259 well area of Chenghao mainly shows a shallow lacustrine delta front subfacies, which is basically the band Spread in the plane. There are three microfacies:underwater distribution channel, mouth bar, and interdistributory bay.
     (2) The main lithology of Chang-3 member reservoir in this study area are mainly composed of lithic feldspathic sandstones, which has the characteristics of low composition maturity, medium textural maturity, and sub-round to sub-angular shaped. Interstitial materials are mainly authigenic clay minerals and carbonate minerals that were formed cement. The main types of pore cementation are pore-film cemented and a few of films-pore type cement.
     (3) Chang-3 member reservoir in Xi-259 well area is a low porosity and low permeability reservoirs, which main reservoir spaces are esidual intergranular pores, followed by dissolution holes. The main throat type is lamellar and curved lamellar, followed by necking-type throat and tube-shaped throat. The connectivity of interporosity is poor, and pore fabric shows fine-middle.
     (4) The types of diagenesis of in Chang-3 member are compaction, cementation and dissolution, followed by metasomatism and rupture. The compaction and cementation is one of the main reason which make effective reservoir porosity and permeability low; but the dissolution plays an active role on reservoir properties.
     (5) The ability of Chang-3 reservoir was mainly controlled by sedimentation and diagenesis. Particle size of rock in weaker hydrodynamic deposition is mainly fine, very fine sand, low compositional maturity and medium texture maturity, which is the main reason for low porosity and permeability of reservoir.
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