摘要
古近系阜二段是苏北盆地页岩油勘探重点层段。综合利用溱潼凹陷古近系阜二段538 m系统岩心、薄片、扫描电镜和热解等资料,研究不同类型泥页岩的含油性、储集性、可动性及可压性特征差异。研究结果表明:阜二段纵向上发育3套甜点段,厚度为36~51 m,位于阜二段中下部。一类甜点层具有游离烃含量S_(1)>1.4 mg/g,含油饱和度指数OSI>150 mg/g,渗透率>0.1 md的特点,主要分布于阜二段Ⅰ和Ⅱ亚段;二类甜点层具有游离烃含量S_(1)为1.0~1.4 mg/g,OSI为100~150,渗透率为0.04~0.10 mD的特点。压力系数大于1.2、热演化程度大于0.9%、原油密度低、黏度低是页岩油发育的一类有利区,主要位于深凹带;热演化程度为0.7%~0.9%是页岩油发育的二类区。因此,根据富集主控因素综合评价甜点区的分布范围,为溱潼凹陷下步页岩油勘探指明方向。
The second member of Paleogene Funing Formation is the key member of shale oil exploration in Subei Basin.Based on the data of 538 m system core,thin section,scanning electron microscope and pyrolysis of the second member of Paleogene Funing Formation in Qintong Sag,the characteristics of oil bearing,reservoir,mobility and compressibility of different types of shale are studied.The results show that three sets of dessert segments with a thickness of 36~51 m are developed longitudinally the second member of Funing Formation,which is located in the middle and lower part of the second member of Funing Formation.The first-class sweet spot layer has the characteristics of S_(1)>1.4 mg/g,OSI>150,and permeability>0.1 mD,and is mainly distributed in the I and II sub-members of the second member of Funing Formation.The second-class dessert layer has the characteristics of S_( 1) is 1.0~1.4 mg/g,OSI is 100~150,and permeability is 0.04~0.10 mD.Pressure coefficient greater than 1.2,thermal evolution degree greater than 0.9%,low crude oil density and low viscosity are the first-class favorable areas for shale oil development,which are mainly located in the deep concave zone.The degree of thermal evolution is 0.7%~0.9%,which is a class II area for shale oil development.Therefore,according to the main controlling factors of enrichment,the distribution range of dessert area is comprehensively evaluated to point out the direction for the next shale oil exploration in Qintong Sag.
作者
荆晓明
JING Xiaoming(Exploration and Development Research Institute,Sinopec East China Oil&Gas Company,Nanjing 210019,China)
出处
《非常规油气》
2023年第3期31-38,45,共9页
Unconventional Oil & Gas
基金
中国石化科技部项目“东部断陷盆地页岩油目标评价与先导试验”(P20049-3)。
关键词
甜点评价
页岩油
阜二段
溱潼凹陷
sweet spot evaluation
shale oil
the second member of Funing Formation
Qintong Sag
