川中磨溪地区龙王庙组晶粒白云岩储集性能及成因机制
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摘要
以岩心观察和薄片鉴定为基础,结合沉积学、储层地质学等相关理论为指导,针对磨溪地区下寒武统龙王庙组晶粒白云岩开展了较精细的储层特征及成因研究。研究结果表明,川中地区龙王庙组晶粒白云岩储层储集性能良好,其主要的储集岩类型为粉晶白云岩及具残余颗粒结构的粉晶白云岩;储集空间包括晶间孔、晶间溶孔、溶洞与裂缝,总体上表现为"中低孔低渗"的孔隙型和孔隙-裂缝型储层。研究区晶粒白云岩储层的发育及演化受到沉积作用和成岩作用的共同控制:位于古地貌高地的台坪相及颗粒滩相为储层的形成奠定了物质基础;白云岩化和重结晶作用是形成现今粉晶白云岩及具残余颗粒结构粉晶白云岩的最直接原因;而多期溶蚀改造是研究区晶粒白云岩储层次生孔隙和溶洞形成的关键。综合以上研究认识建立了龙王庙组粉晶白云岩储层成因演化模式,并将其演化划分为同生沉积成岩阶段、埋藏阶段及构造破裂阶段。
This paper studies that the development of the crystal dolomite reservoir of Longwangmiao Formation in central Sichuan Basin based on the core observation and description,thin section analysis as wellas the latest research on sedimentology and petroleum geology.The research shows that the main types of reservoir rock are powder crystal dolomite with residual particle structure and powder crystal dolomite,and that the reservoir space is dominated by intercrystal pores,intercrystal dissolved pores,dissolved caverns and fissures.Overall the reservoir is a typical pore type and pore-fracture reservoir with low-to-medium porosity and low permeability.Comprehensive analysis shows that the evolution of the reservoir is controlled by deposition and diagenesis.The platform flat lying in palaeogeomorphic highl and of the study area is the precondition to form reservoirs.Besides,the diagenesis is the key to secondary porosity and cavern,especially the dolomitization and syngenesis karst.Finally,the evolution of crystal dolomite reservoir of Longwangmiao Formation can be divided into three phases in terms of developing process:syndiagenetic phases,burial phases and tectonic disruption phases.
This paper studies that the development of the crystal dolomite reservoir of Longwangmiao Formation in central Sichuan Basin based on the core observation and description,thin section analysis as wellas the latest research on sedimentology and petroleum geology.The research shows that the main types of reservoir rock are powder crystal dolomite with residual particle structure and powder crystal dolomite,and that the reservoir space is dominated by intercrystal pores,intercrystal dissolved pores,dissolved caverns and fissures.Overall the reservoir is a typical pore type and pore-fracture reservoir with low-to-medium porosity and low permeability.Comprehensive analysis shows that the evolution of the reservoir is controlled by deposition and diagenesis.The platform flat lying in palaeogeomorphic highl and of the study area is the precondition to form reservoirs.Besides,the diagenesis is the key to secondary porosity and cavern,especially the dolomitization and syngenesis karst.Finally,the evolution of crystal dolomite reservoir of Longwangmiao Formation can be divided into three phases in terms of developing process:syndiagenetic phases,burial phases and tectonic disruption phases.
引文
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[14]张建勇,周进高,潘立银,等.川东北地区孤立台地飞仙关组优质储层形成主控因素:大气淡水淋滤及渗透回流白云岩化[J].天然气地球科学,2013,24(1):9-18.
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[17]钟怡江,陈洪德,林良彪,等.川东北地区中三叠统雷口坡组四段古岩溶作用与储层分布[J].岩石学报,2011,27(8):2272-2280.
[18]朱亚东,孟庆强,胡文瑄,等.塔里木盆地深层寒武系地表岩溶型白云岩储层及后期流体改造作用[J].地质评论,2012,58(4):691-701.
[19]赵文智,沈安江,潘文庆,等.碳酸盐岩岩溶储层类型研究及对勘探的指导意义:以塔里木盆地岩溶储层为例[J].岩石学报,2013,29(9):3213-3222.
[20]蒋志斌,王兴志,曾德铭,等.川西北下二叠统栖霞组有利成岩作用与孔隙演化[J].中国地质,2009,36(1):101-109.
[21]丁熊,谭秀成,周彦,等.四川盆地中部嘉二段储层特征及成因[J].成都理工大学学报:自然科学版,2012,39(3):269-276.
[22]宋文海.乐山-龙女寺古隆大中型气田成藏条件研究[J].天然气工业,1996,16(增刊):12-26.
[23]冯增昭,彭勇民,金振奎,等.中国早寒武世岩相古地理[J].古地理学报,2002,4(1):1-12.
[24]赵文智,沈安江,周进高,等.礁滩储集层类型、特征、成因及勘探意义:以塔里木和四川盆地为例[J].石油勘探与开发,2014,41(3):257-267.
[25]李伟,余化琪,邓鸿斌.四川盆地中南部寒武系地层划分对比与沉积演化特征[J].石油勘探与开发,2012,39(6):681-690.
[26]杨雪飞,王兴志,代林呈,等.川中地区下寒武统龙王庙组沉积相特征[J].岩性油气藏,2015,27(1):95-101.
[27]杨雪飞,王兴志,唐浩,等.四川盆地中部磨溪地区龙王庙组沉积微相研究[J].沉积学报,2015,33(5):972-982.
[28]Yang Xuefei,Tang Hao,Wang Xingzhi,et al.Dolomitization by penesaline sea water in Early Cambrian Longwangmiao Formation,Central Sichuan Basin,China[J].Journal of Earth Science,2017,28(2):305-314.
[29]强子同.碳酸盐岩储层地质学[M].北京:石油大学出版社,1998.
[2]高树生,胡志明,安为国,等.四川盆地龙王庙组气藏白云岩储层孔洞缝分布特征[J].天然气工业,2014,34(3):103-109.
[3]黄文明,刘树根,张长俊,等.四川盆地寒武系储层特征及优质储层形成机理[J].石油与天然气地质,2009,30(5):566-575.
[4]姚根顺,周进高,邹宏伟,等.四川盆地下寒武统龙王庙组颗粒滩特征及分布规律[J].海相油气地质,2013,18(4):1-8.
[5]李亚林,巫芙蓉,刘定锦,等.乐山-龙女寺古隆起龙王庙组储层分布规律及勘探前景[J].天然气工业,2014,34(3):61-66.
[6]张满郎,谢增业,李熙喆,等.四川盆地寒武纪岩相古地理[J].沉积学报,2010,28(1):128-139.
[7] Yang Xuefei,Wang Xingzhi,Tang Hao,et al.The Caledonian paleokarstification of Longwangmiao Formation,Lower Cambrian in the central Sichuan Basin,China[J].Carbonates and Evaporates,2017,32(3):325-335.
[8] Yang Xuefei,Wang Xingzhi,Tang Hao,et al.Reservoir characteristics and main controlling factors of Longwangmiao Formation in Moxi area,Central Sichuan Basin,China[J].Arabian Journal of Gensciences,2016,9(3):217.doi:10.1007/s12517-015-2066-2
[9]杨雪飞,王兴志,代林呈,等.川中地区下寒武统龙王庙组储层成岩作用研究[J].地质科技情报,2015,34(1):35-41.
[10]刘树根,黄文明,张长俊,等.四川盆地白云岩成因的研究现状及存在问题[J].岩性油气藏,2008,20(2):6-15.
[11]陈更生,曾伟,杨雨,等.川东北部飞仙关组白云岩化成因探讨[J].天然气工业,2005,25(4):40-41.
[12]郑荣才,耿威,郑超,等.川东北地区飞仙关组优质白云岩储层的成因[J].石油学报,2008,29(6):815-821.
[13]胡作维,黄思静,张超,等.碳酸盐白云岩化作用模式研究进展[J].海洋地质前沿,2011,27(10):1-13.
[14]张建勇,周进高,潘立银,等.川东北地区孤立台地飞仙关组优质储层形成主控因素:大气淡水淋滤及渗透回流白云岩化[J].天然气地球科学,2013,24(1):9-18.
[15]刘宏,谭秀成,李凌,等.孔隙型碳酸盐岩储集层特征及主控因素:以川西南嘉陵江组嘉5段为例[J].石油勘探与开发,2011,38(3):275-281.
[16]罗川又,张帆,王兴志,等.川东北地区飞仙关组成岩作用对储层的影响[J].石油天然气学报:江汉石油学院学报,2009,31(5):182-189.
[17]钟怡江,陈洪德,林良彪,等.川东北地区中三叠统雷口坡组四段古岩溶作用与储层分布[J].岩石学报,2011,27(8):2272-2280.
[18]朱亚东,孟庆强,胡文瑄,等.塔里木盆地深层寒武系地表岩溶型白云岩储层及后期流体改造作用[J].地质评论,2012,58(4):691-701.
[19]赵文智,沈安江,潘文庆,等.碳酸盐岩岩溶储层类型研究及对勘探的指导意义:以塔里木盆地岩溶储层为例[J].岩石学报,2013,29(9):3213-3222.
[20]蒋志斌,王兴志,曾德铭,等.川西北下二叠统栖霞组有利成岩作用与孔隙演化[J].中国地质,2009,36(1):101-109.
[21]丁熊,谭秀成,周彦,等.四川盆地中部嘉二段储层特征及成因[J].成都理工大学学报:自然科学版,2012,39(3):269-276.
[22]宋文海.乐山-龙女寺古隆大中型气田成藏条件研究[J].天然气工业,1996,16(增刊):12-26.
[23]冯增昭,彭勇民,金振奎,等.中国早寒武世岩相古地理[J].古地理学报,2002,4(1):1-12.
[24]赵文智,沈安江,周进高,等.礁滩储集层类型、特征、成因及勘探意义:以塔里木和四川盆地为例[J].石油勘探与开发,2014,41(3):257-267.
[25]李伟,余化琪,邓鸿斌.四川盆地中南部寒武系地层划分对比与沉积演化特征[J].石油勘探与开发,2012,39(6):681-690.
[26]杨雪飞,王兴志,代林呈,等.川中地区下寒武统龙王庙组沉积相特征[J].岩性油气藏,2015,27(1):95-101.
[27]杨雪飞,王兴志,唐浩,等.四川盆地中部磨溪地区龙王庙组沉积微相研究[J].沉积学报,2015,33(5):972-982.
[28]Yang Xuefei,Tang Hao,Wang Xingzhi,et al.Dolomitization by penesaline sea water in Early Cambrian Longwangmiao Formation,Central Sichuan Basin,China[J].Journal of Earth Science,2017,28(2):305-314.
[29]强子同.碳酸盐岩储层地质学[M].北京:石油大学出版社,1998.
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