Identification and characterization of strike-slip faults and traps of fault-karst reservoir in the Shunbei area, Tarim Basin

doi:10.3969/j.issn.1672-7703.2020.03.010

Abstract

Abstract: There are three principal types of reservoirs in the Ordovician objective strata in the Shunbei area: cave type, fracture type and vug type. Reservoir is characterized by strong heterogeneity and reservoir scale is controlled by strike-slip fault systems with multi-stage activities. The seismic response characteristics of fault-karst reservoirs penetrated by wells vary widely, which makes them difficult to predict and describe. Different from karst fracture-cavity trap, fault-karst reservoir trap is a kind of special carbonate fracture-cavity trap formed under complex conditions. It is characterized by large vertical range and strong horizontal heterogeneity. It is not controlled by local structural morphology and has no unified oil-water contact. Top sealing is provided by regional overlying mudstone, and lateral sealing can be provided by tight carbonate rocks. On the basis of previous research and understandings, seismic identification modes of strike-slip faults and fault-controlled fracture-cavity reservoirs have been established by the use of forward modeling, well-seismic calibration and seismic reflection characteristics analysis. Reservoir identification and description technologies have been formed using gradient structure tensor to determine the shapes of fault-karst reservoirs, using amplitude change rate and chaotic phase attributes to classify and predict interior reservoirs in fault zones, and using multi-attribute fusion to characterize and describe fault-karst reservoirs. Technologies for fault-karst reservoir identification and trap description have been established. The application of these technologies has guided the deployment of several wells in the Shunbei area, which have achieved major breakthroughs in oil and gas discovery. The penetration rate of reservoirs is 84%, which proves the validity and applicability of the technologies. This provides a solution and technical reference for identification and description of fault-karst reservoirs in the Shunbei Oil and Gasfield, as well as other areas, and is of great significance for the exploration and development of fault-karst reservoirs in ultra-deep formations in the Shunbei Oilfield.

CLC Number:

Li Haiying, Liu Jun, Gong Wei, Huang Chao, Ren Lidan. Identification and characterization of strike-slip faults and traps of fault-karst reservoir in the Shunbei area, Tarim Basin[J]. China Petroleum Exploration, 2020, 25(3): 107-120.

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