Hydrocarbon Generation Evolution of Permo-Carboniferous Rocks of the Bohai Bay Basin in China

The Bohai Bay Basin is a Mesozoic subsidence and Cenozoic rift basin in the North China Craton. Since the deposition of the Permo-Carboniferous hydrocarbon source rock, the basin has undergone many tectonic events. The source rocks have undergone non-uniform uplift, twisting, deep burying, and magmatism and that led to an interrupted or stepwise during the evolution of hydrocarbon source rocks. We have investigated the Permo-Carboniferous hydrocarbon source rocks history of burying, heating, and hydrocarbon generation, not only on the basis of tectonic disturbance and deeply buried but also with new studies on apatite fission track analysis, fluid inclusion measurements, and the application of the numerical simulation of EASY % Ro. The heating temperature of the source rocks continued to rise from the Indosinian to Himalayan stage and reached a maximum at the Late Himalayan. This led to the stepwise increases during organic maturation and multiple stages of hydrocarbon generation. The study delineated the tectonic stages, the intensity of hydrocarbon generation and spatial and temporal distribution of hydrocarbon generations. The hydrocarbon generation occurred during the Indosinian, Yanshanian, and particularly Late Himalayan. The hydrocarbon generation during the late Himalayan stage is the most important one for the Permo-Carboniferous source rocks of the Bohai Bay Basin in China.

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。