高邮凹陷黄珏—马家嘴地区古近系戴南组透镜状砂体成因分析  

Genetic Analysis of the Lenticular Sand in the Paleogene Dainan Formation in Huangjue-Majiazui Area in Gaoyou Sag

作　　者：刘金华[1] 吴立峰[1] 吴艳梅[1] 刘健[1] 罗洪飞[1] 

机构地区：[1]中国石化江苏油田地质科学研究院,江苏扬州225012

出　　处：《天然气地球科学》2015年第2期261-268,共8页Natural Gas Geoscience

摘　　要：高邮凹陷黄珏—马家嘴地区戴南组发育扇三角洲沉积,储层砂体主要受扇三角洲分流河道控制,呈现明显的条带状分布,但大量透镜状的含油气砂体出现与储层分布规律之间存在矛盾,因而开展了其成因分析。研究区戴南组叠合含油面积呈现连片含油特征,单一小层的含油面积却表现为透镜状或者断层切香肠状,在部分地区出现了透镜状的孤立含油区域;并且从注水效果分析,砂体连通率低,注水后见效井少,见效好的油井普遍沿物源方向,但沿物源方向受效距离短,该类特征说明研究区储层存在较强非均质性。通过大量的岩心观察,发现研究区全区内变形构造发育,在借鉴国外的成熟经验基础上,特别是Shanmugam提出的砂(泥)质碎屑流沉积、浊流沉积等理论,提出了"小型滑塌岩性油藏储层成因模式",认为研究区透镜状含油砂体是已沉积地层在一定的诱发因素下形成地层滑塌,出现软沉积物的变形作用,最终导致储层局部物性变差,使得有效储层呈现透镜状分布。Fan-delta was developed in the Dainan Formation of Gaoyou Sag,and the distribution o{ the sand- body was controlled by the distributary channel, but the existence of many lenticular oil-sand is inconsistent with the distribution of reservoir,so we do the genetic research on the lenticular sand. The overlapping oil- bearing area of Dainan Formation is continuous,but the o＇il-bearing area of the single sublayer is lenticular or allantoid. By the analysis of the water injection response,the communication of the sand is bad,response wells are little, the better response wells followed the provenance direction, but the distance of the response well is short,so the characteristic o{ the water injection showed that the reservoirs of the work area are with higher anisotropy. After the observation of well core,there are many soft sediment deformations,and on the base of the foreign experience,especially the theory of detrital liquid by Shanmugam, the small-size olistostrome genetic model of lithologic hydrocarbon reservoir was set up,and we think that the lenticular oil-sand was formed bv the olistostrome in the layer, and the soft sediment deformation caused the bad physical property of the reservoir,so the distribution of the oil sand became lenticular.

关 键 词：透镜状砂体 滑塌沉积 软沉积物变形 高邮凹陷 戴南组 

分 类 号：TE122.2[石油与天然气工程—油气勘探]