五彩湾凹陷石炭系油气成藏控制因素及勘探建议

The Controlling Factors of the Oil and Gas Reservior Forming in Carboniferous, Wucaiwan Depression and Some Suggestions for Exploration

石炭统滴水泉组高成熟的烃源岩为五彩湾凹陷石炭系提供了较为丰富的气源,彩25井区石炭系顶面为一大型鼻状构造,在此背景下局部高点控制了油气的分布。石炭系存在三个地质界面,其中第一个界面即石炭系风化壳是油气聚集的有利场所,其溶孔、溶洞的发育程度直接影响了各井的产能。因此,在该区石炭系油气藏受构造和岩性物性的双重控制,是该区石炭系形成孤立油气藏的主要原因。今后的勘探应以该界面为主要目的层,以寻找高效的串珠状的油气藏为主。

The high-maturated oil fountain rock of Carboniferous Dishuiquan group provided plentiful sources of gas to Carboniferous of Wucaiwan depression, the surface of Carboniferous of Cai 25 well area is a huge nosed structure, and in the background, part top points control the distribution of oil and gas. There are three geologic interfaces in Carboniferous, the first one is winded shell, which is the advantageous place to gathering oil and gas, and the degree of growth of the melt hole in the winded shell decide the output of each well. So, in this area, oil and gas reservoir of Carboniferous is controlled by both structure and the rock's physical character, which is the main reason why Carboniferous forms isolated oil and gas reservoir in this area. Exploration in future should take this interface as the main objective layer, to find out an efficient string of oil and gas reservoirs.