渤海海盆地文安斜坡上古生界成藏史数值模拟
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摘要
本文综合利用钻井、测井、地震等资料,应用盆地模拟技术,结合流体包裹体测温、包裹体拉曼光谱成分分析及自生伊利石测年等先进方法,对渤海湾盆地冀中坳陷文安斜坡石炭—二叠系的埋藏史、地热史、生排烃史和成藏演化史进行了数值模拟。
     研究表明,本区石炭—二叠纪烃源岩在中生代发生一次生烃和排烃,并有油气充注,后因燕山运动导致地层抬升,一次生烃和成藏过程中止;在早第三纪,原来东倾的地层变为西倾,断块圈闭开始具雏形;至早第三纪沙二末期,石炭—二叠系的大部分地层古地温再次超过中生代一次生烃的温度,开始二次生烃和排烃,圈闭持续发育;晚第三纪末—第四纪,二次生烃、排烃达到高峰,二次成藏完成。沙三期火成岩较大范围的侵入石炭—二叠系,对生烃和成藏具有积极意义,通过计算得出火成岩对生烃的贡献为62.4%。
     本文首次在文安斜坡应用成藏年代学精确地测得了以石炭—二叠纪煤系为源岩的油气藏成藏年龄为108.274±1.57Ma;进一步完善了盆地模拟软件,首次定量地模拟计算了火成岩侵入对生烃的贡献这一技术难题,在这一方向上我们作了大胆的尝试。
By comprehensively applying the data of logging, drilling and seismic data, and depending on basin-modeling technology, and synchronously, integrating fluid inclusion homogenization, Raman spectrum ingredient assay and autogeny illite Age-determining technique, we had the numeric modeling of Carboniferous-Permian coal measure, including burial history, terrestrial heat history, hydrocarbon-generating and hydrocarbon-expulsing history and reservoir-forming history, at the Wenan Slope of Jizhong Depression, in the Bohaiwan Basin.
    Through research, The organic matter of source rocks in Carboniferous-Permian coal measure strata began first hydrocarbon-generating in mesozoic, and the first hydrocarbon-filling took place. But, because of Yanshan movement later, the Carboniferous-Permian strata rose, as a result, the first hydrocarbon-generating and reservoir-forming paused; In early Tertiary period, because Carboniferous-Permian strata dipping forward east originally turned into dipping forward west, the prototype of faulted block began to form gradually; By the end of Sha-3 period of early Tertiary, the paleogeotherm of Carboniferous-Permian strata exceed the Mesozoic's temperature again, and accordingly, abundant hydrocarbon was generated and expulsed secondly. The trap continued to develop; from the end of late Tertiary to Quaternary, the second hydrocarbon-generating and expulsing got to its peak, and the second reservoir-forming was over. In the period of Sha-3 Formation, Volcanic cocks invaded into Carboniferous-Permian strata in a large scale, which can bring positive effect on hydrocarbon generating and reservoir-forming. Through modeling and calculation, we have figured out that contribution to hydrocarbon-generating caused by volcanic rocks' invasion is 62.4 percent.
    In my article, we first have made a conclusion by reservoir-forming chronology that the forming-age of reservoir is 108.27 ?.57Ma, of which, the source rock came from Carboniferous-Permian strata; We have perfected our Basin-modeling software, so it can calculate quantificationally the contribution radio to hydrocarbon-generating caused by igneous intrusion as a technical problem, in which we have a daring trail.
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