| 准噶尔盆地西北缘扇体形成演化与扇体油气藏勘探 |
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| 关键词:fans sedimentation exploration direction of fan body hydrocarbon reservoirs thrusting fault Permian-Jurassic the northwest Junggar basin |
| 基金项目:中国博士后科学基金资助项目(编号:2003033021); 新疆油田分公司油气勘探工程重点项目 |
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| Fans Sedimentation and Exploration Direction of Fan Hydrocarbon Reservoirs in Foreland Thrust Belt of the Northwestern Junggar Basin |
| The Permian-Jurassic alluvial-fan,subaqua-fan,fan delta were well occured and widely distributed in foreland fold-and-thrust belt of the northwest Junggar basin. Synsedimentary faults acting in varied period strictly controlled sedimentation and distribution of various fans from Permian to Jurassic. The fan bodies formed at P_1j and P_3w have the largest distribution and scale. The Permian was characterized by a model of forward thrusting movement of synsedimentary controlling-fan faults and obvious gradual advance migration response of fan bodies from the margin to the center of Junggar basin. The fan bodies formed at T_1b and T_2k own the largest distribution and scale from T_1b to J_2t stage. Triassic-Jurassic was characterized a model of shrink back thrusting migration of controlling-fan faults and gradual countermarch migration response of fan bodies from the center to the edge of Junggar basin.Known fan petroleum pools mainly enrich in four subfacies belt(root-middle part of underwater fan and alluvial fan, fan delta plain-front), as well as six horizons(P_1j、P_ 2-3 w、T_1b、T_2k、J_1b、J_2t). Permian-Triassic fans have plenty of oil-bearing formation, large scale of petroleum pool, higher reserves abundance. But Jurassic fans went in opposite conditions. Fan bodies mainly formed fault block oil reservoir, stratigraphic unconformity oil pools, structural-lithological oil pools, lithological pools which are concerned with faults and unconformity. Structural pools mainly distribute at scalariform fault belt and root-middle part of fans, lithological pools mainly forms at slope belt and middle-front of fans. The main controlling factors of petroleum pool forming are trusting fault, unconformity, lithofacies and physical nature of fans. There were the pool-forming pattern of vertical migration-accumulation with the setup of fans and thrusting faults at scalariform fault belt; and the pool-forming pattern of lateral migration-accumulation with the combination of fans and unconformity at slope belt. The pool-forming condition of fan boides was favorable, its prove extent was lower, and residual resources potential was great. Then the seven beneficial exploration domains and favorable blocks in future are pointed out in foreland thrust belt of the northwest Junggar basin. |
| WEI Yuan-jiang,LI De-sheng,HU Su-yun,LEI Zhen-yu,HE Deng-fa.2007.Fans Sedimentation and Exploration Direction of Fan Hydrocarbon Reservoirs in Foreland Thrust Belt of the Northwestern Junggar Basin[J].Acta Geoscientica Sinica,28(1):62-71. |
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