高邮凹陷南断阶阜一段储层特征及物性主控因素
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摘要
不同低渗透储层特征差异大,尤其是物性特征对渗流能力和开发效果有着重要影响。以岩芯为基础,综合采用普通薄片、铸体薄片等多种测试手段对高邮凹陷南断阶阜一段储层特征进行分析,结合岩石相、沉积相、成岩特征研究储层物性的控制因素,探讨低渗透砂岩背景下的优质储层形成条件。研究结果表明:高邮凹陷南断阶阜一段储层为低孔低渗透储层,其成分和结构成熟度中等,孔隙度一般为15%,渗透率一般为10×10-3μm2。沉积作用是形成低渗透储层的基础性因素,控制着砂体的发育,决定了后期成岩作用的类型和强度;成岩作用的压实作用、胶结作用和溶蚀作用对储层物性起决定性作用,优质储层的形成主要受后期碳酸盐溶蚀作用控制。寻找次生孔隙发育储层是该地区下一步油气开发的方向和突破点。
The characteristics of different low permeability reservoirs vary greatly,and especially the physical characteristics have an important impact on the seepage capability and development efficiency.This study analyzed the reservoir features of the first member of the Funing Formation in south fault terrace of the Gaoyou sag with conventional thin section and casting thin section techniques based on core data.In addition,we studied the controlling factors of reservoir physical properties combining with lithofacies,sedimentary facies and diagenetic characteristics,and discussed the formation conditions of high-quality reservoir in low permeability sandstone.The result shows that this reservoir has moderate compositional maturity and textural maturity,and low porosity and permeability,with average porosity of 15% and average permeability of 10 × 10~(-3)μm~2.Sedimentation is a basic factor of this low permeability reservoir,which controls the development of sand bodies and determines the type and intensity of the late diagenesis.The compaction,cementation and dissolution of rocks are critical to the reservoir physical properties.The formation of high-quality reservoir is mainly controlled by carbonate dissolution.Those reservoirs with secondary pores are the direction and breakthrough of the oil and gas development in the region.
The characteristics of different low permeability reservoirs vary greatly,and especially the physical characteristics have an important impact on the seepage capability and development efficiency.This study analyzed the reservoir features of the first member of the Funing Formation in south fault terrace of the Gaoyou sag with conventional thin section and casting thin section techniques based on core data.In addition,we studied the controlling factors of reservoir physical properties combining with lithofacies,sedimentary facies and diagenetic characteristics,and discussed the formation conditions of high-quality reservoir in low permeability sandstone.The result shows that this reservoir has moderate compositional maturity and textural maturity,and low porosity and permeability,with average porosity of 15% and average permeability of 10 × 10~(-3)μm~2.Sedimentation is a basic factor of this low permeability reservoir,which controls the development of sand bodies and determines the type and intensity of the late diagenesis.The compaction,cementation and dissolution of rocks are critical to the reservoir physical properties.The formation of high-quality reservoir is mainly controlled by carbonate dissolution.Those reservoirs with secondary pores are the direction and breakthrough of the oil and gas development in the region.
引文
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周勇,纪友亮,张善文,等,2011.胶莱盆地莱阳凹陷莱阳组低渗透砂岩储层特征及物性控制因素[J].石油学报,32(4):611-620.
周正,汪兴志,谢林,等,2014.川中地区震旦系灯影组储层特征及物性影响因素[J].天然气地球科学,25(5):701-708.
祝海华,钟大康,张亚雄,等,2014.川南地区三叠系须家河组致密砂岩孔隙类型及物性控制因素[J].石油与天然气地质,35(1):65-76.
丁圣,钟思瑛,高国强,等,2012b.测井地质结合定量评价低渗透储层成岩相[J].西南石油大学学报(自然科学版),34(4):83-87.
高静乐,宋广寿,高辉,等,2008.西峰油田庄40区块长6储层特低渗透成因与主控因素[J].沉积学报,26(4):640-646.
邱隆伟,黄双泉,2009.民丰洼陷沙三段孔隙发育特征及储层物性主控因素[J].中国石油大学学报(自然科学版),33(4):10-15.
吴旭光,2014.鄂尔多斯盆地西南部延长组储层物性特征及其控制因素:以陇东地区长3、长4+5油层组为例[J].西安石油大学学报(自然科学版),29(6):1-5.
熊伟,刘华勋,高树声,等,2009.低渗透储层特征研究[J].西南石油大学学报(自然科学版),31(5):89-92.
岳绍飞,黄传炎,严德天,等,2015.洛伊地区三叠系上统致密砂岩储层孔隙特征及物性影响因素[J].中国石油大学学报(自然科学版),46(1):208-216.
周勇,纪友亮,张善文,等,2011.胶莱盆地莱阳凹陷莱阳组低渗透砂岩储层特征及物性控制因素[J].石油学报,32(4):611-620.
周正,汪兴志,谢林,等,2014.川中地区震旦系灯影组储层特征及物性影响因素[J].天然气地球科学,25(5):701-708.
祝海华,钟大康,张亚雄,等,2014.川南地区三叠系须家河组致密砂岩孔隙类型及物性控制因素[J].石油与天然气地质,35(1):65-76.