The identifcation technology for developmental periods of karst cave reservoirs and its application

doi:10.3969/j.issn.1672-7703.2018.03.013

Abstract

Abstract: The connectivity of karst cave reservoirs is diffcult to identify and affects their effective development. The root causes are attributed to the unclear identifcation of the development periods and distribution rules of the karst cave reservoirs. The method of layered interpretation of karst cave reservoirs was used to predict the distribution of the karst cave reservoirs in different periods. First, on the basis of the knowledge that the cave layers are mainly controlled by underflow surfaces, the paleogeomorphology was restored, and then representative wells were selected from high to low paleogeomorphologic structures, the karst discharge datum was determined, and the cave layers were divided into single wells; second, according to the isochronal sedimentary interfaces, seismic data volumes were flattened, and the cave layers for single wells were calibrated on seismic sections; and fnally, the cave layers were fnely interpreted, the RMS amplitude was extracted, and the lateral distribution of every reservoir layer was predicted. Based on the distribution law of single-layer caves, the connectivity of karst cave reservoirs was analyzed, and 22 Ordovician fracture-cave reservoir units were identifed in the LGX area in the Tarim Basin. This may provide technical support for the effective development of the reservoirs.

Key words: paleokarst, underflow surface, cave stratifcation, seismic interpretation

CLC Number:

Chang Shaoying, Deng Xingliang, Chang Zhongying, Cao Peng, Cao Xiaochu. The identifcation technology for developmental periods of karst cave reservoirs and its application[J]. China Petroleum Exploration, 2018, 23(3): 109-114.

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