Determination of oil source rock palaeotemperature ascertains the direction of oil-gas exploration in Huahai-Jinta Basin

摘要

Having a good oil-generation condition, the Lower Cretaceous Xinminbao Group is the main oil-generation bed in the Huahai Depression. Although the Huahai-Jinta Basin has an exploration history of about 21 years, and has numerous oil indications, little advance has been made on oil exploration. Based on a synthetical study of geological data, and by using many methods such as apatite fission track, fluid inclusion, vitrinite reflectance and clay mineral transformation, we draw a conclusion that the early oil-generation and migration period with high palaeotemperature. is not well coordinated with the formation stage of structure trap which formed much later and that the stratigraphic depositional trap formed in Mesozoic occupies an important place in the future oil exploration.