韩杨;杨海波;郭文建;蒋文龙;王韬;任海姣;

• 1:中国石油新疆油田分公司勘探开发研究院

摘要：

准噶尔盆地盆1井西凹陷二叠系烃源岩热演化阶段及油气成藏过程认识不清。根据取心、测录井及地球化学等资料，采用盆地模拟和生烃热模拟实验方法，恢复二叠系烃源岩热演化史、生烃史，确定不同生烃阶段与构造演化的匹配关系，分析烃源岩生烃演化对油气成藏的影响，建立两期生烃、两期调整的油气成藏模式。结果表明：二叠系风城组、下乌尔禾组烃源岩整体在侏罗纪开始成熟，分别于早白垩世、古近纪末期进入高成熟生气阶段，现今多为高成熟—过成熟阶段。二叠系烃源灶位于凹陷中心及前哨次凹，风城组、下乌尔禾组烃源岩生烃强度最高分别为5.62×10~6、1.02×10~6 t/km~2。两套烃源岩错峰生烃为研究区奠定持续供烃背景，与构造调整、多套储层共同控制研究区油气纵向立体成藏，早期生成的油气多向石西—莫北凸起等环凹高部位运聚成藏，晚期形成的高熟天然气在近源的前哨2井区聚集成藏，油气的多期充注及调整在研究区内形成4类油气藏——早期新生古储油气藏、中期次生调整油气藏、晚期中浅层高熟气藏和源内非常规油气藏，前哨地区、石西—莫北凸起具有良好的油气勘探潜力。该结果为盆1井西凹陷油气勘探提供支撑。

关键词： 烃源岩;热演化史;生烃史;成藏模式;二叠系;盆1井西凹陷;准噶尔盆地

Abstract: Thermal evolution and hydrocarbon accumulation process of Permian source rocks in the well PEN1western depression is still unclear.Based on coring,logging and geochemical data,basin simulation technology and hydrocarbon generation experiment,the thermal evolution and the hydrocarbon generation model of the Middle-Lower Permian source rocks was established which determine the main hydrocarbon generation period.In addition,the influence of hydrocarbon generation evolution on accumulation process was analyzed,and hydrocarbon accumulation model by two stages of hydrocarbon generation and adjustment are established.The results show that,the source rocks of Fengcheng Formation and Lower Wuerhe Formation entered the mature oil generation stage in the Late Triassic,and entered the highly mature gas generation stage in the Early Cretaceous.At present,the central area has reached the highly mature to over mature stage;source rocks of Lower Wuerhe Formation entered the mature oil generation stage in the Late Jurassic,and entered the highly mature gas generation stage at the end of Paleogene,which is now the end of the highly mature stage.The hydrocarbon generation center of the Permian source rocks is located in the center of the sag and the Qianshao Sag.The highest hydrocarbon generation intensity of source rocks in Fengcheng Formation can reach 5.62×10~6 t/km~2,and the maximum hydrocarbon generation intensity of Lower Wuerhe Formation source rocks can reach 1.02×10~6 t/km~2.Different hydrocarbon generation periods provide the basis for continuous hydrocarbon supply,four types of oil and gas reservoirs have been formed in the multi-layer reservoir,include oil and gas accumulated in ancient reservoirs in the early stage,reservoirs after secondary adjustment in the middle stage,late middle-shallow highly mature gas reservoirs and unconventional oil and gas in source rocks.Moreover,Qianshao Area and Shixi-Mobei Uplift are the favorable enrichment areas in the well PEN1western depression.This result has supporting significance for oil-gas exploration in the well PEN1western depression.

Keywords: source rocks;thermal evolution;hydrocarbon production;accumulation;Permian;well PEN1western depression;Junggar Basin

基金项目: 中国石油天然气股份有限公司前瞻性基础性重大科技项目(2021DJ0206)

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