滨里海盆地北部盐下油气成藏条件与模式研究

Forming condition for hydrocarbon accumulation and hydrocarbon accumulation pattern in the Northern part of Pre-Caspian Basin

目的分析滨里海盆地北部盐下油气成藏条件,建立成藏模式。方法通过钻井、岩心观察、地震和测井解释等近年来的勘探资料进行地质分析。结果明确了该地区油气生、储、盖等地质特征,确定了其油气成藏控制因素,提出了"一"字型成藏模式(自生自储,油气横向运移)、"Z"字型成藏模式(自生自储,油气横向运移)、"人"字型成藏模式(下生上储,油气垂向运移)、"从"字型成藏模式(自生自储,油气侧向运移)、"众"字型成藏模式(自生上储,油气侧向运移)5种油气成藏模式。结论滨里海盆地北部地区盐下层系处于烃源岩和碳酸盐岩发育的有利相带,且具有厚层的盐岩层作为优质盖层,是盐下油气勘探的重点目标区。

Aim To study forming condition for hydrocarbon accumulation pattern.Methods Based on exploration data of drilling,core observation,thin section identification,seismic and logging data,geological comprehensive analysis was made.Results Characteristics of hydrocarbon source rock,reservoir and seal layer were analyzed,the controlling factors of hydrocarbon accumulation were determined,and five hydrocarbon accumulation patterns were put forward.Conclusion The pre-salt formations in the Northern part of Pre-Caspian Basin,which has favorable hydrocarbon source rocks and carbonate rocks with thick salt formations as high-quality seal layer,is the focus target area of il gas exploration of pre-salt formations.