济阳坳陷车西洼陷油-源对比及运移规律探讨

通过对车西洼陷下第三系烃源岩特征、原油地化特征及油源对比、油气运移规律的综合研究认为,现今埋深2800~3000m以下的Es^3(下—中)烃源岩是车西洼陷主力烃源岩,埋深2200m以下的Es^3(上)及Es¹烃源岩具有一定的低熟资源潜力;目前已发现的原油绝大多数源于Es^3(下)优质烃源岩,而源于Es³(中),Es^3(上)及Es¹烃源岩的原油仅有零星发现;Es^3(下)烃源岩早期生成油气以顺油源断层垂向运移至Es²储层成藏为主,后期由于垂向运移通道封闭,则以侧向进入Es^4(上)储层或古潜山储层中成藏为主,Es^3(下)烃源岩下伏Es^4(上)储层或古潜山储层圈闭应该是今后勘探的重点。

OIL-SOURCE CORRELATION AND MIGRATION REGULARITIES IN THE CHEXI SAG,THE JIYANG DEPRESSION

Based on comprehensive study of source rock, geochemical characteristics of crude oil, correlation of oil and source and hydrocarbon migration pattern of the Eogene in Chexi sag, this paper draws seve-ral conclusions. Source rock in the lower-middle Es~3 (the third member of Shahejie formation of Eogene) which is buried 2 800-3 000 m below is the major source rock in Chexi sag. Source rock in the upper Es~3 and Es~1 which is buried 2 200 m below has some potential of immature oil. At present, most crude oil comes from the high-grade source rock of lower Es~3. Sporadic petroleum discoveries are related to source rock of the middle Es~3, upper Es~3 and Es~1. Petroleum generated from source rock of the lower Es~3 at first migrated vertically through faults to reservoir beds in Es~2. Later, because that the vertical pathway was sealed, petroleum migrated laterally to reservoir beds in the upper Es~4 or buried hill reservoir. These reservoir beds below source rock of the lower Es~3 area the most important area for future exploration.