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以储层流体包裹体样品分析为基础,结合成岩史、埋藏史、生烃史、构造演化史,对库车前陆冲断带不同构造油气充注期次及成藏过程进行了研究,提出研究区油气充注具有多期性且不同构造油气充注具有明显差异,康村早中期(16.3~11 Ma)与康村晚期—库车早中期(11~3Ma)部分构造有少量原油和高成熟度油气充注,库车晚期—第四纪(3~0 Ma)全区天然气大规模强充注,为天然气成藏的主要时期.研究结果表明:气烃包裹体最为常见,在所有构造都有分布,液烃、气液烃包裹体仅部分构造发育.荧光观察显示液烃、气液烃包裹体呈黄色-黄绿色与蓝色-蓝白色荧光.共生盐水包裹体均一温度测试表明均一温度主峰数量与峰值在不同构造发生了变化,克拉有两个主峰温度(80~90℃,110~120℃),大北有3个主峰温度(90~110℃,120~130℃,140~150℃),克深有1个主峰温度(140~150℃),第1个峰值温度由北向南逐渐提高.构造演化进一步揭示了油气充注上的差异受控于断层活动与圈闭形成的异步性,可以推测向南继续勘探仍能发现库车晚期—第四纪一期成藏的干气藏.
Based on the analysis of fluid inclusions in the reservoir and the combination of diagenesis history, burial history, hydrocarbon generation history and tectonic evolution history, this paper studies the hydrocarbon accumulation periods and accumulation processes of different tectonic reservoirs in the Kuqa foreland thrust belt The hydrocarbon accumulation in the study area is multi-stage and varies significantly in different tectonic settings. A small amount of crude oil and high hydrocarbon content are formed in the early-mid-Kangmou period (16.3-11 Ma) and late Kangmcun-Kuqa (11-3Ma) Maturity oil and gas filling, large scale intensive filling of natural gas in Quaternary (3 ~ 0 Ma) region during the late period of Kuche and the main period of natural gas accumulation.The results show that gas and hydrocarbon inclusions are the most common, Both hydrocarbon and gas-liquid hydrocarbon inclusions developed only partially.Fluorescence observation showed that the liquid hydrocarbons and gas-liquid hydrocarbon inclusions showed yellow-greenish yellow and blue-blue-white fluorescence.The homogenization temperature of symbiosis brine inclusions showed homogeneous There are two main peak temperatures (80 ~ 90 ℃, 110 ~ 120 ℃) in Carat and three main peak temperatures in Dabei (90 ~ 110 ℃, 120 ~ 130 ℃, 140 ~ 150 ℃), there is one main peak temperature (140 ~ 150 ℃), the first peak temperature from north to south And gradually increase.The tectonic evolution further reveals that the difference in hydrocarbon filling is controlled by the asynchronousity of fault activity and trap formation.It can be speculated that exploration in the south can still be found in the Kuqa period - Tibetan.