Geological characteristics and controlling factors of the fourth member of Dengying Formation in Pengshen well 1-Dongba well 1
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摘要:
灯影组是四川盆地中部重要的油气勘探层系，为查明蓬深1井—东坝1井区灯影组四段（简称灯四段）储层特征及成因，通过钻井岩心观察、岩石薄片鉴定及孔渗性实验对灯四段岩石类型、储集空间类型进行分析。结果显示，研究区灯四段储集岩类型包括藻白云岩、泥—粉晶云岩、角砾云岩及砂屑云岩，储集空间以次生溶蚀孔洞为主，残留原生孔隙和改造裂缝次之，溶蚀孔洞的发育具有沿裂缝及生物藻纹层分布的特点，发育溶孔-孔隙-裂缝型复合储层特点。根据成因差异可将灯四段储层划分为埋藏岩溶型储层、表生-埋藏叠加改造型储层、构造-热液改造型储层3类，其中表生-埋藏叠加改造型储层集中分布在灯四段顶部。丘滩体沉积控制储层物质组成，发育早期格架孔，控制储层纵向展布，表生期溶蚀及埋藏岩溶作用控制次生溶孔的发育与平面分布，裂缝发育沟通孤立孔隙，促进流体溶蚀作用发生，提高储层渗透率。
Abstract:The Dengying Formation is an important oil and gas exploration layer in the central Sichuan Basin. In order to investigate the reservoir characteristics and genesis of the fourth member of the Dengying Formation in the Pengshen well 1-Dongba well 1 area, the rock type and reservoir space type of the fourth member of the Dengying Formation were analyzed through drilling core observation, rock thin section identification and permeability experiments. The results show that the reservoir rock types in the fourth member of the Dengying Formation of the study area include algal dolomite, mud powder crystal dolomite, breccia dolomite, and sandstone dolomite. The reservoir space is mainly composed of secondary dissolution pores, followed by residual primary pores and modified fractures. The development of dissolution pores has the characteristics of distribution along fractures and biological algae layers, and the development of dissolution pore pore fracture composite reservoirs has the characteristics of dissolution pore pore fracture type. According to the differences in genesis, the fourth member of Dengying Formation reservoir can be divided into three types: burial karstification type reservoirs, surface-buried superimposed modified reservoirs and structural hydrothermal modified reservoirs. Among them, the surface-buried superimposed modified reservoirs are concentrated at the top of the fourth member of the Dengying Formation. The sedimentation of the reef-beach body controls the composition of reservoir materials, develops early framework pores, controls the longitudinal distribution of the reservoir, controls the development and planar distribution of secondary dissolution pores through surface and buried karst processes, communicates with isolated pores through fracture development, promotes fluid dissolution, and increases reservoir permeability
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图 1 四川盆地区域地质图（a）及岩性综合柱状图（b）
Figure 1. Regional geological map (a) and lithological composite column diagram (b) of Sichuan Basin
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图 2 灯四段储层孔渗性特征
a—柱塞样孔隙度分布直方图；b—柱塞样渗透率分布直方图；c—柱塞样孔隙度-渗透率关系图；c—全直径样孔隙度分布直方图；e—全直径样渗透率分布直方图；f—全直径样孔隙度-渗透率关系图
Figure 2. Porosity and permeability characteristics of the Deng 4 reservoir
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