黄骅坳陷歧古1井古生界烃源岩的二次生烃演化

黄骅坳陷歧古1井的古生界烃源岩自形成以来经历了复杂的构造—埋藏史,并发生多次生烃演化。基于详细的构造-埋藏史研究,并结合矿物包裹体分析,运用EASY％R_o数值模拟技术,深入研究了歧古1井的古生界烃源岩的埋藏史、受热史和生烃史,阐明了歧古1井古生界生烃作用发生的构造期次、生烃强度,揭示了歧古1井古生界烃源岩曾发生过多次重要的生烃作用过程,其主要发生在海西—印支期和喜马拉雅晚期,得出了主要二次生烃作用发生在喜马拉雅晚期的重要结论,并提出了歧口凹陷是有望实现黄骅坳陷深层古生界找油突破的有利地域。

The Second Hydrocarbon-generation Evolution of Palaeozoic Source Rocks in Qigu-1 Well in the Huanghua Depression

Palaeozoic source rocks discovered in Qigu-1 well has undergone a complicated tectonic-burial history since they were formed. During this period, repeated hydrocarbon-generation evolution has been taken place. Based on the detailed study of the tectonic-burial history in combination with the analyses of fluid inclusions, and by means of the EASY%.R0 numerical simulation, the authors conducted research into the burial history, heated history and hydrocarbon-generation history of the Palaeozoic hydrocarbon source rocks in Qigu-1 well, and discuss their evolution process, tectonic episodes and the strength of hydrocarbon-generation. This study reveals that repeated hydrocarbon-generation processes took place in the Palaeozoic hydrocarbon sources mainly during the Hercynian - Indosinian and the late Himalayan. Moreover, it is concluded that the second hydrocarbon-generation of the Palaeozoic source rocks took place in the late Cenozoic. Finally, the paper points out that the Qik-ou Depression is a prospective area for oil and gas prospecting in the deep payers of the Palaeozoic in the Huanghua Depression.