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通过对柴西南区昆北断阶带路乐河组油藏精细解剖,分析昆北断阶带岩性油藏形成条件并建立其成藏模式。研究认为:昆北断阶带路乐河组发育具一定构造背景的上倾尖灭岩性油藏和地层-上倾尖灭复合岩性油藏。古斜坡与河道砂体相交配置形成岩性圈闭,在昆北断裂下盘丰富油源供给下,通过断裂-不整合-砂体复式输导于中新世(N1)早期和上新世(N21)以后运聚成藏。在此基础上,构建了源外复式输导岩性圈闭晚期成藏模式。该模式对认识柴西南区岩性油藏形成规律和指导下一步岩性油藏勘探具有重要意义。
Through the fine dissection of the Lehe Group reservoir in the Kunbei fault zone in the southwestern Qaidam basin, the formation conditions of the lithologic reservoirs in the Kunbai faulted belt were analyzed and their accumulation patterns were established. The study shows that the Lehe Formation in the Kunbai fault belt of the Kunlun Mountains developed an up-dip lithotrophic reservoir with a certain tectonic setting and a dip-up-dip complex reservoir. The paleo-slope intersects with the channel sand body to form lithologic traps. Under the supply of rich oil source from the lower well of the Kunbei fault, the fault-unconformity-sand complex is transported to the Miocene (N1) early and Pliocene N21) after the accumulation of accumulation. On the basis of this, a late accumulation model of lithologic traps with extra-source complex conductivity was constructed. This model is of great significance for understanding the formation of lithologic reservoirs in Qaidam Basin and guiding the further exploration of lithologic reservoirs.