Acta Petrolei Sinica ›› 2020, Vol. 41 ›› Issue (3): 329-341.DOI: 10.7623/syxb202003007

• Oil Field Development • Previous Articles     Next Articles

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

Shang Xiaofei1, Duan Taizhong1, Zhang Wenbiao1, Cheng Hong2, Liu Yanfeng1   

  1. 1. Sinpoec Exploration & Production Research Institute, Beijing 100083, China;
    2. Sinpoec Northwest Oilfield Company, Xinjiang Urumqi 830011, China
  • Received:2019-03-27 Revised:2019-11-30 Online:2020-03-25 Published:2020-04-03

断控岩溶主控的缝洞型碳酸盐岩内部溶蚀相带表征——以塔河油田10区奥陶系油藏为例

商晓飞1, 段太忠1, 张文彪1, 程洪2, 刘彦锋1   

  1. 1. 中国石油化工股份有限公司石油勘探开发研究院 北京 100083;
    2. 中国石油化工股份有限公司西北油田分公司 新疆乌鲁木齐 830011
  • 通讯作者: 商晓飞,男,1986年5月生,2008年获山东科技大学学士学位,2015年获中国石油大学(北京)博士学位,现为中国石油化工股份有限公司石油勘探开发研究院高级工程师,主要从事油气田开发地质、油藏描述与地质建模工作。Email:shangxf.syky@sinopec.com
  • 作者简介:商晓飞,男,1986年5月生,2008年获山东科技大学学士学位,2015年获中国石油大学(北京)博士学位,现为中国石油化工股份有限公司石油勘探开发研究院高级工程师,主要从事油气田开发地质、油藏描述与地质建模工作。Email:shangxf.syky@sinopec.com
  • 基金资助:

    国家自然科学基金项目(No.4170235)和国家科技重大专项(2016ZX05033-003-003)资助。

Abstract:

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.

Key words: fracture-cavity reservoir body, fault-controlling karst, dissolution facies belt, karst evolution, geological modeling, Tahe oilfield

摘要:

以塔河油田10区的典型井组为研究对象,在明确断裂主控岩溶的背景下,分析岩溶作用过程与缝洞空间分布的关系,揭示了研究区缝洞体内幕结构及油气生产差异机理。通过对钻井、地震、示踪剂等动态和静态资料的分析,将研究区缝洞储集体划分为洞穴型、孔洞型、裂缝-孔洞型和裂缝型4种类型。结合地球物理描述与相似露头观察,分析断控岩溶作用下溶洞的发育过程,并建立基于成因演化的缝洞空间分布模式。岩溶作用下储层的发育具有分带性,依据该模式从内向外划分出4个溶蚀相带,分别是大型溶洞带、溶蚀孔洞密集区、缝洞联合发育体以及最外围的裂缝破裂带。不同的溶蚀相带其发育的主要储集体类型、储集物性、井震特征以及储量和产能情况有较大差异。在此基础上,结合生产动态资料所揭示的不同井之间的响应和连通情况,明确了研究区不同钻井分别钻遇了不同发育程度或演化阶段的缝洞溶蚀相带,且主要存在溶洞连通、缝洞连通和裂缝连通3种沟通方式。通过对缝洞溶蚀相带空间配置关系的有效刻画,采用确定性建模方法建立岩溶储层三维地质模型,并取得较好的数值模拟效果。

关键词: 缝洞型储集体, 断控岩溶, 溶蚀相带, 岩溶演化, 地质建模, 塔河油田

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