王场地区盐间泥质白云岩油藏“甜点”地震预测

"Sweet spot"prediction of inter-salt argillaceous dolomite reservoir in Wangchang area

潜江凹陷盐间泥质白云岩分布面积达1800km2,纵向上有193个Ⅲ级韵律层。据三次资评研究结果,潜江凹陷盐间泥质白云岩生油量为43×108t,资源量达1.68×108t,而潜江凹陷王场地区是盐间泥质白云岩油藏成藏最有利的地区,王场地区盐间泥质白云岩油藏是典型的非常规油藏,"甜点"主要受含油性和储集条件控制。通过开展岩石物理分析、地震相、叠前弹性参数反演、方位各向异性研究,结合地质认识,最终明确了王场地区潜34油组10韵律层段"甜点"的分布范围。

In Qianjiang Depression,China,inter-salt argillaceous dolomite covers an area of 1800km2,and there are 193cyclothems of grade III.According to the third resource evaluation,oil generation volume may have as much as 43×108 tones in the argillaceous dolomite in Qianjiang Depression.And oil resources can reach 1.68×108 tones.The Wangchang area in Qianjiang Depression is considered as the most favorable area for inter-salt argillaceous dolomite reservoir-forming.Inter-salt argillaceous dolomite in the area is a typical unconventional reservoir.'Sweet Spot 'is mainly controlled by oil-bearing property and reservoir conditions.Through petro-physics,seismic facies,prestack elastic parameter inversion,azimuth anisotropy research,and combined with the geological knowledge,'sweet spots' of 10th rhythm member in Qian 3oil formation is predicted in Wangchang area.