鄂尔多斯盆地南部长8致密储层微观特征及控制因素
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摘要
近年来鄂尔多斯盆地南部长8油层组致密油勘探开发取得了重要进展,而储层微观特征作为致密油藏评价的核心内容,严重制约着油藏的高效开发。本次研究利用薄片鉴定、扫描电镜、常规压及X-衍射等资料对储层微观特征进行精细描述并从沉积成岩出发探讨其控制因素。研究区长8储层有利储集空间为原生粒间孔及长石次生溶孔,合计面孔率为2.49%;孔吼连通性及分选很差;实测孔隙度为7.95%、渗透率为0.35mD,为典型的致密储层。压实作用具有差异化特征,压实与胶结作用(除绿泥石环边胶结)是储层致密的控制因素,绿泥石环边胶结与溶蚀作用共同成为研究区长8油层组物性改善的有利因素。因此,绿泥石胶结与次生溶蚀发育带为勘探的有利区带。
In recent years,the development of dense oil exploration and development in Chang-8 oil formation in southern Ordos basin has made important progress,and the reservoir micro-characteristics were the core contents of the dense reservoir evaluation,which seriously restrict the efficient development of the reservoir.In this paper,the micro-characteristics of the reservoir were described by using the basic geological data,thin section identification,scanning electron microscopy,conventional mercury intrusion and X-ray diffraction,and the controlling factors were discussed from the sedimentology and diagenesis.The results showed that the main reservoir space of Chang-8 reservoir is the primary intergranular pore and the feldspar secondary pore,the total face rate is 2.49%.Hole roar connectivity and poor sorting;measured porosity 7.95%,permeability 0.35 mD,which is a typical dense reservoir.Mechanical compaction and cementation(in addition to chlorite ring gluing)are the main controlling factors for the deterioration of reservoir physical properties.The cementite cementation and dissolution are the favorable factors to improve the physical properties of Chang-8 reservoir in the study area.Therefore,on the basis of grasping the macroscopic characteristics of the reservoir,chlorite cementing and secondary erosive development zone are favorable zones for exploration.
In recent years,the development of dense oil exploration and development in Chang-8 oil formation in southern Ordos basin has made important progress,and the reservoir micro-characteristics were the core contents of the dense reservoir evaluation,which seriously restrict the efficient development of the reservoir.In this paper,the micro-characteristics of the reservoir were described by using the basic geological data,thin section identification,scanning electron microscopy,conventional mercury intrusion and X-ray diffraction,and the controlling factors were discussed from the sedimentology and diagenesis.The results showed that the main reservoir space of Chang-8 reservoir is the primary intergranular pore and the feldspar secondary pore,the total face rate is 2.49%.Hole roar connectivity and poor sorting;measured porosity 7.95%,permeability 0.35 mD,which is a typical dense reservoir.Mechanical compaction and cementation(in addition to chlorite ring gluing)are the main controlling factors for the deterioration of reservoir physical properties.The cementite cementation and dissolution are the favorable factors to improve the physical properties of Chang-8 reservoir in the study area.Therefore,on the basis of grasping the macroscopic characteristics of the reservoir,chlorite cementing and secondary erosive development zone are favorable zones for exploration.
引文
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[10]张君峰,毕海滨,许浩,等.国外致密油勘探开发新进展及借鉴意义[J].石油学报,2015,36(2):127-137.
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[17]罗静兰,李忠兴,史成恩,等.鄂尔多斯盆地西南部上三叠统延长组长8、长6油层组的沉积体系与物源方向[J].地质通报,2008,27(1):101-111.
[18]赵靖舟.非常规油气有关概念、分类及资源潜力[J].天然气地球科学,2012,23(3):82-82.
[19]王国亭,何东博,李易隆,等.吐哈盆地巴喀气田八道湾组致密砂岩储层分析及孔隙度演化定量模拟[J].Acta Geologica Sinica,2012,86(11):1847-1856.
[20]纪友亮,周勇,刘玉瑞,等.高邮凹陷古近系阜宁组一段沉积特征对储层成岩作用及物性的影响[J].Acta Geologica Sinica,2014,88(7):1299-1310.
[21]ZAHID M A,DONG C,LIN C,et al.Sequence stratigraphy,sedimentary facies and reservoir quality of Es4s,southern slope of Dongying Depression,Bohai Bay Basin,East China[J].Marine&Petroleum Geology,2016,77:448-470.
[22]刘金库,彭军,刘建军,等.绿泥石环边胶结物对致密砂岩孔隙的保存机制——以川中—川南过渡带包界地区须家河组储层为例[J].石油与天然气地质,2009,30(1):53-58.
[23]CHEN Z Y,YAN H,LI J S,et al.Relationship between Tertiary volcanic rocks and hydrocarbons in the Liaohe basin,People's Republic of China[J].AAPG Bulletin,1999,83(6):1004-1014.
[24]李汶国,张晓鹏,钟玉梅.长石砂岩次生溶孔的形成机理[J].石油与天然气地质,2005,26(2):220-223.
[25]刘林玉.碎屑岩储集层溶蚀型次生孔隙发育的影响因素分析[J].沉积学报,1998(2):97-101.
[26]刘金库,彭军,石岩,等.致密砂岩储层石英溶蚀成因及对孔隙发育的影响——以川中—川南过渡带须家河组为例[J].石油学报,2015,36(9):1090-1097.
[27]曲希玉,陈修,邱隆伟,等.石英溶解型次生孔隙的成因及其对储层的影响——以大牛地气田上古生界致密砂岩储层为例[J].石油与天然气地质,2015,36(5):804-813.
[28]杨超,王香增,任来义,等.鄂尔多斯盆地延长探区南部长8油层组物源性质及构造背景[J].石油天然气学报,2013,35(10):32-36.
[29]陈宝赟,李荣西,梁积伟,等.自生绿泥石及其对储层物性影响研究——以鄂尔多斯盆地西南缘延长组为例[J].矿物岩石地球化学通报,2014,33(3):389-394.
[2]HAMMER E,MAI B E M,NAESS A.Facies controls on the distribution of diagenesis and compaction in fluvial-deltaic deposits[J].Marine&Petroleum Geology,2011,27(8):1737-1751.
[3]罗静兰,刘新社,付晓燕,等.岩石学组成及其成岩演化过程对致密砂岩储集质量与产能的影响:以鄂尔多斯盆地上古生界盒8天然气储层为例[J].地球科学——中国地质大学学报,2014,39(5):537-545.
[4]黄思静,武文慧,刘洁,等.大气水在碎屑岩次生孔隙形成中的作用——以鄂尔多斯盆地三叠系延长组为例[J].地球科学——中国地质大学学报,2003,28(4):419-424.
[5]兰叶芳,邓秀芹,程党性,等.鄂尔多斯盆地三叠系延长组次生孔隙形成机制[J].地质科技情报,2014(6):128-136.
[6]袁珍,李文厚,郭艳琴.鄂尔多斯盆地东南缘延长组石油充注对砂岩储层成岩演化的影响[J].高校地质学报,2011,17(4):594-604.
[7]任大忠,孙卫,黄海,等.鄂尔多斯盆地姬塬油田长6致密砂岩储层成因机理[J].地球科学,2016,41(10):1735-1744.
[8]贾承造.论非常规油气对经典石油天然气地质学理论的突破及意义[J].石油勘探与开发,2017(1):1-11.
[9]贾承造,邹才能,李建忠,等.中国致密油评价标准、主要类型、基本特征及资源前景[J].石油学报,2012,33(3):343-350.
[10]张君峰,毕海滨,许浩,等.国外致密油勘探开发新进展及借鉴意义[J].石油学报,2015,36(2):127-137.
[11]邹才能,张国生,杨智,等.非常规油气概念、特征、潜力及技术——兼论非常规油气地质学[J].石油勘探与开发,2013,40(4):385-399.
[12]杨华,李士祥,刘显阳.鄂尔多斯盆地致密油、页岩油特征及资源潜力[J].石油学报,2013,34(1):1-11.
[13]王建民.鄂尔多斯盆地南部中生界大中型油田形成条件与勘探策略[J].石油勘探与开发,2006,33(2):145-149.
[14]陈林.鄂尔多斯盆地西南部延长组长8砂岩储层沉积相及致密化机理研究[D].武汉:中国地质大学(武汉),2015:126-144.
[15]朱筱敏.沉积岩石学[M].北京:石油工业出版社,2008:137-154.
[16]刘志华,谈明轩,丁晓琪.鄂尔多斯盆地富县地区长8和长6物源分析[J].油气藏评价与开发,2012(5):11-14.
[17]罗静兰,李忠兴,史成恩,等.鄂尔多斯盆地西南部上三叠统延长组长8、长6油层组的沉积体系与物源方向[J].地质通报,2008,27(1):101-111.
[18]赵靖舟.非常规油气有关概念、分类及资源潜力[J].天然气地球科学,2012,23(3):82-82.
[19]王国亭,何东博,李易隆,等.吐哈盆地巴喀气田八道湾组致密砂岩储层分析及孔隙度演化定量模拟[J].Acta Geologica Sinica,2012,86(11):1847-1856.
[20]纪友亮,周勇,刘玉瑞,等.高邮凹陷古近系阜宁组一段沉积特征对储层成岩作用及物性的影响[J].Acta Geologica Sinica,2014,88(7):1299-1310.
[21]ZAHID M A,DONG C,LIN C,et al.Sequence stratigraphy,sedimentary facies and reservoir quality of Es4s,southern slope of Dongying Depression,Bohai Bay Basin,East China[J].Marine&Petroleum Geology,2016,77:448-470.
[22]刘金库,彭军,刘建军,等.绿泥石环边胶结物对致密砂岩孔隙的保存机制——以川中—川南过渡带包界地区须家河组储层为例[J].石油与天然气地质,2009,30(1):53-58.
[23]CHEN Z Y,YAN H,LI J S,et al.Relationship between Tertiary volcanic rocks and hydrocarbons in the Liaohe basin,People's Republic of China[J].AAPG Bulletin,1999,83(6):1004-1014.
[24]李汶国,张晓鹏,钟玉梅.长石砂岩次生溶孔的形成机理[J].石油与天然气地质,2005,26(2):220-223.
[25]刘林玉.碎屑岩储集层溶蚀型次生孔隙发育的影响因素分析[J].沉积学报,1998(2):97-101.
[26]刘金库,彭军,石岩,等.致密砂岩储层石英溶蚀成因及对孔隙发育的影响——以川中—川南过渡带须家河组为例[J].石油学报,2015,36(9):1090-1097.
[27]曲希玉,陈修,邱隆伟,等.石英溶解型次生孔隙的成因及其对储层的影响——以大牛地气田上古生界致密砂岩储层为例[J].石油与天然气地质,2015,36(5):804-813.
[28]杨超,王香增,任来义,等.鄂尔多斯盆地延长探区南部长8油层组物源性质及构造背景[J].石油天然气学报,2013,35(10):32-36.
[29]陈宝赟,李荣西,梁积伟,等.自生绿泥石及其对储层物性影响研究——以鄂尔多斯盆地西南缘延长组为例[J].矿物岩石地球化学通报,2014,33(3):389-394.