阿联酋二叠系Khuff组气藏成藏模式与成藏过程分析

发布时间：2018-03-30 18:27

本文选题：成藏模式　切入点：Khuff组　出处：《天然气地球科学》2017年04期

【摘要】：二叠系Khuff组是中东地区最主要的天然气产层。阿联酋自20世纪70年代开展Khuff组勘探以来,发现了多个构造圈闭,但钻探测试效果不佳,陆上圈闭测试均为干层,海上圈闭测试气藏规模有限,非烃含量高,严重制约了下一步勘探工作。Khuff组气藏具有良好的生储盖组合,气源来自于下志留统Qusaiba组烃源岩;三叠系Sudair组泥灰岩和Khuff组中部的石膏层作为其盖层,分布稳定。在区域调研基础上,综合分析认为:气藏构造发育与烃源生排烃的时空耦合是影响阿联酋北部Khuff组气藏有效性的关键因素。综合多种资料建立的成藏模式表明:阿联酋海域Khuff组圈闭自二叠系沉积末期就受盐隆影响,构造开始发育,后期虽受阿卡迪亚、海西、扎格罗斯等多期构造运动影响,但圈闭依然保持完整,良好的生—运—聚匹配关系使得原油在侏罗纪充注其中;在晚白垩世,原油裂解成气,圈闭有效成藏;但受TSR作用影响,后期H_2S和CO_2等非烃气体大量发育。陆上Khuff圈闭则受扎格罗斯构造运动影响,于渐新世才开始发育,未能有效地捕获油气。
[Abstract]:Permian Khuff formation is the most important natural gas layer in the Middle East.Since the exploration of Khuff formation in the United Arab Emirates in the 1970s, several structural traps have been discovered, but the results of drilling test are not good. The tests of onshore traps are all dry-beds, the scale of offshore trap test gas reservoirs is limited, and the non-hydrocarbon content is high.The gas source is from the lower Silurian Qusaiba source rock, and the mudstone of the Triassic Sudair formation and the gypsum layer of the middle part of the Khuff formation are regarded as the caprock of the gas reservoir, which is the caprock of the gas reservoir of the Khuff formation and the middle part of the Khuff formation, and the gas source is derived from the source rock of the Lower Silurian formation.On the basis of regional investigation and comprehensive analysis, it is concluded that the spatiotemporal coupling between gas reservoir structure development and hydrocarbon source and hydrocarbon expulsion is the key factor that affects the effectiveness of Khuff formation gas reservoir in the northern part of the United Arab Emirates.The reservoir forming model established by synthesizing many kinds of data shows that the Khuff formation traps in the United Arab Emirates have been affected by salt uplift since the late Permian sedimentary period, and the structure began to develop, although the late stage is influenced by the Acadia, Hercynian, Zagros and other multi-stage tectonic movements.However, the trap remains intact, and the good source-transportation-accumulation matching relationship makes the crude oil filled in the Jurassic; in the late Cretaceous, the crude oil was cracked into gas, and the trap was effectively formed, but affected by TSR,In the late stage, the non-hydrocarbon gases such as H2S and CO_2 developed in large quantities.The Khuff trap on land was affected by Zagroth tectonic movement and developed in Oligocene, which failed to capture oil and gas effectively.
【作者单位】：中国石油川庆钻探工程公司地质勘探开发研究院;中国石油海外天然气技术中心;中国石油中东公司;
【基金】：中国石油川庆钻探工程有限公司科技项目“海外油气田快速评价技术研究”(编号:CQ2015B-7-1-1)资助
【分类号】：P618.13

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