关于下扬子中北部地区晚控古储油气藏的探讨

On Late—Controlled Paleozoic Oil and Gas Accumulation in the Middle North of Lower Yangtze Area

笔者在《关于下扬中北部地区箕状构造找油的几问题》一文中,在着重从构造形态方面探讨中古生界箕状构造油气成控条件的同时,还简要提到晚期成藏问题。笔者所说的晚期成藏,并非是指新生新储,而是特指晚控古储。

The late-controlled paleozoic oil and gas accumulatinon is a kind of late-stage oil and gas accumulation which is formed by the combination of middle Paleozoic accumulation condition of rift environment,Mesozoic and Cenozoic various trap condition and multi-stage and multi-direction oil and gas origin. Ithas undertaken the geological formation and deformation and oil-gas generation and destruction. The middle Paleozoic lost its role of oil-gas generation and control power and is replaced by oil-gas generation, accumulation and transportation, whereas the mesozoic particularly, the Cretaceous system still keeps its cover property, but lack of oil-gas generation and trap conditions. Therefore, the new and old strata constitute a complete oil-gas generation-trap-cover system. It is necessary to carried out oil-gas exploration according to the realistic condition and work degree of each area in the area which has been detailed investigated and has optimum condition of late controlled paleozoic oil-gas accumulation. Particularly, the Cretaceous tectonic trap and the combination of rift-surface-trap system.