Characterization of dissolution facies belt in fracture-cavity carbonate rocks mainly controlled by fault-controlling karst: a case study of Ordovician reservoirs in the Block 10 of Tahe oilfield

被引：0
作者：
Shang X. [1 ]
Duan T. [1 ]
Zhang W. [1 ]
Cheng H. [2 ]
Liu Y. [1 ]
机构：
[1] Sinpoec Exploration & Production Research Institute, Beijing
[2] Sinpoec Northwest Oilfield Company, Urumqi, 830011, Xinjiang
来源：
Shiyou Xuebao/Acta Petrolei Sinica | 2020年 / 41卷 / 03期
关键词：
Dissolution facies belt; Fault-controlling karst; Fracture-cavity reservoir body; Geological modeling; Karst evolution; Tahe oilfield;
D O I：
10.7623/syxb202003007
中图分类号：
学科分类号：
摘要：
Taking a typical well group in the Block 10 of the Tahe oilfield as the research object, the paper analyzes the relationship between karst process and the spatial distribution of fractures and cavities under the background of fault-controlling karst, and reveals the internal architecture of fractures and cavities and the mechanism for differences in oil and gas production. Based on analyzing the dynamic and static data such as drilling, seismic and tracers, the fracture-cavity reservoir bodies in the study area are divided into four types: cavern, hole, fissure-cavity and fracture. Combined with geophysical descriptions and observations of similar outcrops, the paper analyzes the development of caves under the effect of fault-controlling karst, and establishes a spatial distribution mode of fracture-cavity based on geneses and evolution. This mode proves the zonal development of reservoirs under karst effect. Four dissolution facies belts are divided from the inside to the outside, i.e., large-scale cave belt, concentrated area of dissolved holes, fracture-cavity body developed jointly, and the outermost rupture zone of fracture. In different dissolution facies belts, there are major differences in the types and physical properties of reservoirs, borehole seismic characteristics, reserves and productivity. On this base, in combination with the response and connectivity between different wells revealed by production performance data, it is determined that fracture-cavity dissolution facies belts with various degrees of development or in different evolution stages were encountered during drilling wells in the study area, respectively, and there are three connecting modes, i.e., connected by cave, fracture-cavity body and fracture. Through effectively characterizing the space allocating relation of the fracture-cavity dissolution facies belt, the three-dimensional geological model of karst reservoirs has been established using a deterministic modeling method, obtaining a good effect of numerical simulation. © 2020, Editorial Office of ACTA PETROLEI SINICA. All right reserved.
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页码：329 / 341
页数：12
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