黄骅坳陷深层古生界烃源岩的生烃演化

黄骅坳陷的古生界已遭受多期复杂的构造变动,烃源岩经历了不均一的抬升、变形、埋藏作用,导致烃源岩生烃演化的不连续性和分阶段性。基于详细的构造—埋藏史研究,结合磷灰石裂变径迹测试及矿物包裹体分析,运用EASY%R_o数值模拟技术,深入研究了黄骅坳陷古生界烃源岩的埋藏史、受热史和生烃史,揭示出研究区古生界有机质的阶段性成熟演化和多次生烃作用,阐明了黄骅坳陷古生界烃源岩生烃作用发生的构造期次、生烃强度和时空分异特征,认为黄骅坳陷古生界烃源岩最重要、最有意义的生烃作用发生在喜马拉雅晚期,指出在黄骅坳陷中北部的次级凹陷中有望实现中国东部深层古生界找油突破。

HYDROCARBON-GENERATION EVOLUTION OF PALEOZOIC SOURCE ROCKS IN THE DEEP ZONE OF HUANGHUA DEPRESSION

The Paleozoic source rocks in the Huanghua Depression experienced complicated tectonic alteration with many times, and come through inhomogeneous uplifted, deformed, buried depth or magma effect. The hydrocarbon-generation evolution of Paleozoic source rocks was characterized by discontinuity and grading. Based on detailed study of tectono-burial history, combined with the fission tracks testing and fluid inclusion analyses, and using the EASY% R o numerical simulation, the paper worked on burial history, heated history and hydrocarbon-generation history of Paleozoic source rocks in the depression, which revealed that their maturity evolved stage by stage and many times hydrocarbon-generations, clarified the tectonic episodes, strength of hydrocarbon-generation and time-spatial distribution of the second hydrocarbon-generation. Finally, the paper made an important conclusion that the second hydrocarbon-generation of Paleozoic source rocks occurred in Late Cenozoic and brought forward the subordinate depressions being advantage zones for the depth exploration of Paleozoic oil and gas in the middle-north regions of Huanghua Depression, East China.