冀南地区巨1井石炭—二叠系生烃评价

EVALUATION OF HYDROCARBON GENERATION OF PERMO-CARBONIFEROUS SOURCE ROCKS IN WELL JU-1 IN JINAN AREA

以冀南地区石炭—二叠系烃源岩的生烃评价为目标,基于详细的构造—埋藏史研究,并结合磷灰石裂变径迹测试、有机包裹体分析,深入研究了巨1井的石炭—二叠系烃源岩的生烃演化历史,揭示了巨1井的石炭—二叠系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。分析认为:巨1井处石炭—二叠系烃源岩曾发生过二次重要的生烃作用过程,初次生烃作用发生在印支期,太原组有机质生烃量为6mg/g;而第二次生烃作用发生在喜山早期,太原组有机质生烃量为10mg/g。最后指出在今后的勘探中,要特别重视东营运动的研究,寻找东营运动相对影响小的地区,有望在巨鹿低凸起实现石炭二叠系油气勘探的突破。

Aiming at evaluation of hydrocarbon generation of the Permo-Carboniferous source rocks in Jinan area, this paper thoroughly studies the hydrocarbon generation and evolution history of the Permo-Carboniferous source rocks in Ju-1 well based on detailed study of tectonic-burial history and in combination with apatite fission track test and analysis of organic inclusion. It is revealed that the Permo-Carboniferous source rocks in Ju-1 well have experienced a complex tectonic-burial history since their formation and have generated hydrocarbons for several times. It is believed that the source rocks in the study area have experienced two important hydrocarbon generating processes. The first occurred in Indo-Chinese epoch, with 6mg/g hydrocarbons generated by the organic materials in the Taiyuan Formation. While the second occurred in the early Himalayan period, with 10mg/g hydrocarbons generated from the organic materials in the Taiyuan Formation. It is proposed that study of Dongying movement should be strengthened in future exploration to recognize areas with relatively small influences of Dongying movement. A breakthrough in oil and gas exploration of the Permo-Carboniferous is expected in Julu structural high with low relief.