The Caspian Basin Southeast (BK Block) Of Reservoir Modeling And Fuzzy Comprehensive Evaluation

Southeast of the Caspian Basin is an important oil and gas accumulation zone.And its rich oil and gas resources make it a hot spot of exploration in the world. BKblock and KA blocks adjacent to each other，which are located in the southeastern partof the Caspian Basin. In this paper, combining studies of sedimentology, structuralgeology, geological3D model, multiple regression analysis, fuzzy mathematical theory,the main results achieved are:1. The major research area in the Kala Tong-Tianjizi uplift District Departmentof salt upon strata is BK blocks. Through a comprehensive analysis of sedimentarystrata in the study area，BK reservoir is continental clastic sedimentary rock. Thereservoir is in general for medium porosity and medium permeability reservoirs.2. The geological structure of the block BK is typical Caspian Basin salt domestructure. Through the study of reservoir properties, geological planar distribution toidentify, the differences of the Caspian Basin are found out. It analyses southeast ofsalt upon distribution of oil and gas reservoirs, to find out the favorable forming rules,pointing out that the salt upon petroleum migration have anticlines and faultedanticline traps are the most favorable exploration targets of salt upon strata.3. The characteristics and distribution of the oil and gas fields (Tibet) have beenresearched. Based on the theory of the variogram and convergence algorithm, assignvalues of kriging (interpolation) is used to establish the three-dimensional geologicalmodel first. It is better verifies the accuracy of the reserves calculated by thevolumetric method.4. The existing information on the southeastern region of the Caspian Basinconfirmed subsalt oil source for the oil and gas accumulation of salt upon on theformation is prime importance. Under the favorable geological structures, Mesozoictraps fill mainly occurs in the Triassic–Jurassic, with the possibility of the formationof reservoir. The study use a stepwise regression analysis, the smallest secondarymultiplication and Matlab programme first to optimize the geological factors, find thekey geological factors, and establish fuzzy mathematical model. Through a number offuzzy models to evaluate the contrast, it will get a better judge, finding the optimalmodel, and applied to other blocks.5. Actual production, the three layers found in the KA block have been found inthe Cretaceous reservoir. By contrast with the BK block, with fuzzy comprehensiveevaluation of the mathematics, Triassic is the major target strata as the main exploration, middle Jurassic followed, in the Triassic–Jurassic of KA block.