【摘要】：準噶爾盆地吉木薩爾凹陷中二疊統(tǒng)蘆草溝組普遍發(fā)育超高壓,綜合運用測井、鉆井、試油資料及盆地模擬技術,分析了現(xiàn)今地層壓力特征和超高壓形成機制,并恢復了蘆草溝組古壓力演化特征。研究結果表明,吉木薩爾凹陷現(xiàn)今壓力結構由淺至深可分為常壓帶、淺層超高壓帶、壓力過渡帶和深層超高壓帶4個壓力帶;蘆草溝組位于深層超高壓帶,在橫向上超高壓具有一定的連續(xù)性,剩余壓力多為10~20 MPa,壓力系數(shù)為1.10~1.50.蘆草溝組地層壓力演化經(jīng)歷了3個半"增壓—泄壓"旋回,且壓力演化的旋回性與沉積速率、生烴排烴和構造抬升存在較好的匹配關系;沉積物快速埋藏導致的欠壓實是形成第一期超高壓的主要原因,在三疊紀晚期進入生烴門限后,生烴增壓則成為形成第二期和第三期超高壓的重要機理。
[Abstract]:Ultra-high pressure is generally developed in Lucaogou formation of Middle Permian in Jimusar depression of Junggar Basin. The characteristics of formation pressure and the formation mechanism of ultra-high pressure are analyzed by comprehensive use of logging, drilling, oil testing data and basin simulation techniques. The paleo pressure evolution characteristics of the Lucaogou formation were restored. The results show that the present pressure structure of Jimusar sag can be divided from shallow to deep into four pressure zones: shallow ultra-high pressure zone, pressure transition zone and deep pressure zone. The Lucaogou formation is located in the deep ultra-high pressure zone and has a certain continuity in the transverse. The residual pressure is mostly 10 ~ 20 MPa, and the pressure coefficient is 1.10 ~ 1.50. The formation pressure evolution of the Lucaogou formation has experienced three "pressurized pressure relief" cycles, and there is a good matching relationship between the cycle of pressure evolution and the sedimentation rate, hydrocarbon generation and expulsion of hydrocarbon generation and tectonic uplift. The undercompaction caused by the rapid burial of sediments is the main cause of the formation of the first stage of ultra-high pressure. After entering the threshold of hydrocarbon generation in the late Triassic, hydrocarbon generation pressurization becomes an important mechanism for the formation of the second and third phases of ultra-high pressure.
【作者單位】： 中國石油大學地球科學與技術學院;
【基金】：國家973項目(2014CB239005) 國家科技重大專項(2016ZX05001,2016ZX05006)
【分類號】：P618.13

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