Multi-Scale and Multi-Constraint Geological Modeling of Fault-Controlled Karst Reservoirs

doi:10.7657/XJPG20240611

Abstract

Abstract:

Fault-controlled karst fractured-vuggy reservoirs that are characterized by well-developed fault systems exhibit complex reservoir spaces with significant discreteness and heterogeneity, posing great challenges to fault system modeling and description. Guided by the developmental and genetic patterns of fault-controlled karst reservoirs, a multi-scale and multi-constraint geological model of fault-controlled karst reservoir was established. Depending on the genesis of fault-controlled karst, the development of these reservoirs was divided into four stages (Ⅰ-Ⅳ). Based on the reservoir model of Stage Ⅳ, the fault-controlled karst reservoirs were divided into karst cave facies, dissolution pore facies, and dissolution fracture facies. A fracture development probability cube was constructed with multiple constraints which include ant weight sampling, fault displacement model, and fracture parameter characterization, and two groups of small-scale fractures of NW-SE and NE-SW trending were generated by applying a goal-oriented simulation algorithm. A fracture model of fault-controlled karst was established to reflect the development characteristics of the fractures in fault-controlled karst to the greatest extent, for reducing the uncertainty in fracture prediction. Thus, a new method for predicting fractures in fault-controlled karst reservoirs was formed. The reliability of the proposed model has been validated by the application in two wells, which may support subsequent development research.

Key words: Tahe oilfield, carbonate rock, fractured-vuggy reservoir, fault-controlled karst, geological modeling, fracture characterization

CLC Number:

P618.13

LI Jikang, ZENG Qingyong, GUO Chen, LI Qing, ZHU Lele. Multi-Scale and Multi-Constraint Geological Modeling of Fault-Controlled Karst Reservoirs[J]. Xinjiang Petroleum Geology, 2024, 45(6): 719-724.

Figures/Tables 8

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