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《Xinjiang Petroleum Geology》 2015-01
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Effect of Strata Thickness on Fracture Development in Sand-Mud Interbed

SHANG Lin;DAI Junsheng;FENG Jianwei;YANG Xuejun;WANG Ke;SONG Baoshun;Research Institute of Exploration and Development, Jidong Oilfied Company, PetroChina;School of Geosciences, China University of Petroleum;Research Institute of Exploration and Development,PetroChina, Tarim Oilfied Company;  
In order to study the effect of strata thickness on the fracture development in sand-mud interbed, this paper took the sand-mudinterbed reservoir of braided river delta front in Keshen gas field in Tianshan mountain piedmont as an example, analysed the generationmechanism of structural fractures, calculated the density, aperture and porosity of fractures by using numerical simulation method, andthen proposed six models for fracture development in the sand-mud interbed. The simulated results show that the thinner the single thick-ness of sandstone or mudstone, the easier the fracture generation, also, the fracture development of the interbed is influenced by the stratathickness. In the condition of same stress, the fractures with large aperture and long extension may occur in medium-thick(1.5~10 m)sand-stone, and be able to extend to or penetrate the mudstone. The fractures in thin(less than 1.5 m) sandstone with small aperture have weakeffect on the mudstone. For mudstone of same thickness, the thicker the sandstone in it, the easier the fracture generation, and when themudstone is less than 1 m in thickness, the loaded mudstone is easy to rupture and generate fractures by itself. In the area with similar re-gional tectonic deformation, the underwater distributary channels in braided river delta front are of high fracture porosity and good connec-tivity and could form good reservoirs, followed by mouth bar, distal sand bar, sand sheet and underwater interdistributary sands, they havelow fracture porosity and low connectivity, being difficult to become favorable reservoirs. When the mudstone reaches 1 m and its sandstoneis less than 5.5 m in thickness, it could become the barrier, enough acting as an effective sealing to oil and gas.
【Fund】: 国家科技重大专项(2011ZX05003-04);; 中央高校基本科研业务费专项资金(12CX06004A)
【CateGory Index】: P618.13
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