石油学报 ›› 2020, Vol. 41 ›› Issue (5): 513-525.DOI: 10.7623/syxb202005001

• 地质勘探 •    下一篇

塔河油田奥陶系碳酸盐岩岩溶相形成和演化

金强1, 张三1, 孙建芳2, 魏荷花2, 程付启1, 张旭栋1   

  1. 1. 中国石油大学(华东)地球科学与技术学院 山东青岛 266580;
    2. 中国石油化工股份有限公司石油勘探开发研究院 北京 100083
  • 收稿日期:2019-03-30 修回日期:2020-02-17 出版日期:2020-05-25 发布日期:2020-06-08
  • 通讯作者: 金强,男,1956年5月生,1982年获华东石油学院学士学位,1994年获石油大学(华东)博士学位,现为中国石油大学(华东)地球科学与技术学院教授,主要从事油气地质研究与教学工作。
  • 作者简介:金强,男,1956年5月生,1982年获华东石油学院学士学位,1994年获石油大学(华东)博士学位,现为中国石油大学(华东)地球科学与技术学院教授,主要从事油气地质研究与教学工作。Email:jinqiang@upc.edu.cn
  • 基金资助:

    国家自然科学基金石油化工联合基金项目(No.U1663204)和国家科技重大专项(2016ZX05014-002-007)资助。

Formation and evolution of karst facies of Ordovician carbonate in Tahe oilfield

Jin Qiang1, Zhang San1, Sun Jianfang2, Wei Hehua2, Cheng Fuqi1, Zhang Xudong1   

  1. 1. School of Geosciences, China University of Petroleum, Shandong Qingdao 266580, China;
    2. Sinopec Petroleum Exploration and Production Research Institute, Beijing 100083, China
  • Received:2019-03-30 Revised:2020-02-17 Online:2020-05-25 Published:2020-06-08

摘要:

岩溶储层极为复杂、研究难度大,采用注重控制因素和形成过程的岩溶相分析可以提供更可靠的地质依据。通过塔河油田主体区奥陶系岩溶储层精细描述,发现该区在岩溶期的塔北隆起挤压走滑背景下,呈一系列河流—落水洞—岩溶湖形成的峰丘—高地、残丘—谷地、岩溶湖泊—洼地等岩溶相带:形成了S74(NE向)和S48(近SN向)2个带状峰丘—高地,这两个峰丘—高地将研究区与其他岩溶相带系统隔离开来,河流穿过峰丘—高地以瀑布形式进入喇叭口状残丘—谷地,部分河流通过落水洞进入渗流岩溶带和径流岩溶带形成驻水洞和地下河,部分流入下游的岩溶湖泊—洼地。通过分析峰丘—高地和残丘—谷地岩溶相带的断层—裂缝特征、缝洞溶蚀作用、缝洞充填等岩溶相标志,并引入湖南现代岩溶相带形成过程分析,提出了岩溶相带模式,阐明了地表河与地下河及其缝洞储集空间的分布规律。研究结果为碳酸盐岩缝洞型储层预测评价和地质建模提供了岩溶地质依据。

关键词: 岩溶相分析, 峰丘&mdash, 高地, 残丘&mdash, 谷地, 岩溶湖泊&mdash, 洼地, 断层&mdash, 裂缝, 溶蚀缝洞, 缝洞充填, 塔河油田

Abstract:

It is extremely complex and difficult to study karst reservoirs. The analysis focusing on the control factors and formation processes of karst facies can provide a reliable geological basis. Through the fine characterization of the Ordovician karst reservoirs in the main area of Tahe oilfield, it is found that in the background of compression and strike slip of North Tarim uplift in the karst period, this area displays a series of karst facies belts such as hoodoo-upland, monadnock-river valley, and karst-lake, formed by river-sinkhole-karst lake. The zonal hoodoo-upland S74 (NE) and S48 (nearly SN) were formed, which isolate the study area from other karst facies belt systems. The rivers flow through the hoodoo-upland and enter the funnel-shaped monadnock-river valley in the form of waterfalls. Some rivers enter the vadose karst zone and runoff karst zone through the sinkhole to form caves and underground rivers, and some flow into the downstream karst lake and depression. By analyzing the markers of hoodoo-upland and monadnock-river valley karst facies belts sucha as fault-fracture characteristics, fracture-cavity dissolution and filling, and analyzing the formation process of modern karst facies belt in Hunan, this paper proposes a karst facies belt model, and clarifies the distribution law of surface river and underground river and other fracture-cavity reservoir spaces. The research results provide a karst geological basis for the prediction, evaluation and geological modeling of carbonate fracture-cavity reservoirs.

Key words: karst facies analysis, hoodoo-upland facies, monadnock-river valley facies, karst-lake facies, fault-fracture, fracture-cave, cave filling, Tahe oilfield

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