Characteristics and Genesis of Paleo-Karst Collapses in Ordovician Carbonate Rocks, Tahe Oilfield

新疆石油地质 ›› 2017, Vol. 38 ›› Issue (zk(English) ): 22-29.

Characteristics and Genesis of Paleo-Karst Collapses in Ordovician Carbonate Rocks, Tahe Oilfield

WANG Jianfeng^1a, DENG Guangxiao^1b, LI Taola, MEN Hongkun², ZHANG Ziyi²

1. Sinopec Northwest Oilfield Company, a.Petroleum Development and Management Department; b.Research Institute of Exploration and Development, Urumqi, Xinjiang 830011, China;
2. School of Energy Resources, China University of Geosciences, Beijing 100083, China

收稿日期:2017-04-10 修回日期:2016-06-10 出版日期:2018-01-01 发布日期:2021-05-19

Characteristics and Genesis of Paleo-Karst Collapses in Ordovician Carbonate Rocks, Tahe Oilfield

WANG Jianfeng^1a, DENG Guangxiao^1b, LI Taola, MEN Hongkun², ZHANG Ziyi²

1. Sinopec Northwest Oilfield Company, a.Petroleum Development and Management Department; b.Research Institute of Exploration and Development, Urumqi, Xinjiang 830011, China;
2. School of Energy Resources, China University of Geosciences, Beijing 100083, China

Received:2017-04-10 Revised:2016-06-10 Online:2018-01-01 Published:2021-05-19
About author:WANG Jianfeng,E-mail: wangjf.xbsj@sinopec.com

摘要/Abstract

摘要： Fracture-caved reservoirs in Ordovician carbonate rocks are the main oil and gas reservoirs in Tahe oilfield and the collapse resulted from the subsidence of ancient cave systems is one of the important types of the late karst reformation. Using the data of core, conventional logging, imaging logging, seismic reflection configuration and production performance, the paper analyzes and studies the identification method and the genesis of the collapse in carbonate rocks, presents a set of identification methods applicable to the karst collapses of fracture-caved reservoirs and establishes the corresponding identification criteria for them. Based on the genetic analysis, the karst collapses in Tahe oilfield can be classified into 3 genetic types including fracture induced collapse, overlying stratum load collapse and late-stage hypergene karst collapse. The statistics of 122 collapses of the fracture-caved reservoirs in Tahe oilfield show that the late-stage hypergene karst collapse has the greatest potential for oil and gas development due to the developed fractures and caves within the reservoir.

关键词: Tahe oilfield, Ordovician, fracture and cave, carbonate rock, karst cave, karst collapse, genetic type

Abstract: Fracture-caved reservoirs in Ordovician carbonate rocks are the main oil and gas reservoirs in Tahe oilfield and the collapse resulted from the subsidence of ancient cave systems is one of the important types of the late karst reformation. Using the data of core, conventional logging, imaging logging, seismic reflection configuration and production performance, the paper analyzes and studies the identification method and the genesis of the collapse in carbonate rocks, presents a set of identification methods applicable to the karst collapses of fracture-caved reservoirs and establishes the corresponding identification criteria for them. Based on the genetic analysis, the karst collapses in Tahe oilfield can be classified into 3 genetic types including fracture induced collapse, overlying stratum load collapse and late-stage hypergene karst collapse. The statistics of 122 collapses of the fracture-caved reservoirs in Tahe oilfield show that the late-stage hypergene karst collapse has the greatest potential for oil and gas development due to the developed fractures and caves within the reservoir.

Key words: Tahe oilfield, Ordovician, fracture and cave, carbonate rock, karst cave, karst collapse, genetic type

WANG Jianfeng, DENG Guangxiao, LI Taola, MEN Hongkun, ZHANG Ziyi. Characteristics and Genesis of Paleo-Karst Collapses in Ordovician Carbonate Rocks, Tahe Oilfield[J]. 新疆石油地质, 2017, 38(zk(English) ): 22-29.

WANG Jianfeng, DENG Guangxiao, LI Taola, MEN Hongkun, ZHANG Ziyi. Characteristics and Genesis of Paleo-Karst Collapses in Ordovician Carbonate Rocks, Tahe Oilfield[J]. Xinjiang Petroleum Geology, 2017, 38(zk(English) ): 22-29.

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Characteristics and Genesis of Paleo-Karst Collapses in Ordovician Carbonate Rocks, Tahe Oilfield

Characteristics and Genesis of Paleo-Karst Collapses in Ordovician Carbonate Rocks, Tahe Oilfield

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