渤南洼陷古近系膏盐层对深层油气成藏的影响

世界上许多含油气盆地深层油气藏的形成都与膏盐层有关。针对膏盐层的空间展布及其与油气成藏条件的关系，探讨了济阳坳陷渤南洼陷深层膏盐层对油气运聚的影响。认为：渤南洼陷的膏盐层主要发育在洼陷中心部位，并向南、北依次减薄；膏盐层不仅可作盖层，同时也可储集油气．在膏盐层发育层段．次生孔隙相对发育；膏盐层常伴生异常高压，压力系数高达1．73；膏盐间成藏和膏盐下成藏是该区两种主要的与膏盐层有关的油气成藏模式，发育在膏盐层之下的油气藏数量相对较多，是今后深层油气勘探的重点。图4表1参24

Impact of Paleogene evaporates on hydrocarbon accumulation in deep Bonan Sub-sag, Jiyang Depression

A study on the distribution of Paleogene evaporates and their relationship with hydrocarbon accumulation in deep Bonan Sub-sag indicates that; (1) the evaporates are the thickest at the center and thin out to the south and north; (2) the evaporates can serve as seal on top as well as reservoirs when secondary porosity develops within evaporates; ( 3 ) overpressure may closely associate with evaporates and the pressure coefficient may reach as high as 1. 73 in certain areas; (4) sub-evaporate and evaporate are two major types of reservoirs in the Bonan Sub-sag and therefore greater attention should be paid to the sub-evaporate reservoirs in future exploration.