川北阆中—南部地区长兴组储层特征
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摘要
四川盆地北部阆中—南部(地名)区块处于川中隆起与川北坳陷的斜坡部位,具有优越的成藏条件。运用钻井岩心观察、岩屑描述、铸体薄片观察、压汞分析、地球物理资料解释等分析手段,对研究区长兴组储层特征进行了研究。结果表明,储层发育有利的沉积相带为开阔台地相台内滩亚相及台缘礁滩沉积,储层岩石类型以生物灰岩、砂屑灰岩、泥晶灰岩为主;储层的储集空间类型多样,孔、洞、缝均有,粒间孔、体腔孔为研究区储层主要的孔隙类型;喉道普遍狭窄,喉道类型主要是微喉,少量细喉;平均孔隙度为1.16%,平均渗透率为0.5415×10-3μm2,属特低孔特低渗致密储层;长兴组储层呈现"低频、弱振幅、杂乱反射"的地震响应特征,测井信息反映含气储层具有"两低一高"的特征。
Located in the ramp region between the Central Sichuan uplift and Northern Sichuan depression,the Langzhong-Nanbu area possesses superior accumulation conditions.The reservoir characteristics of the Changxing Formation in the study area were studied by means of core observation,debris description,microscopic observation of cast thin sections,analysis of mercury intrusion and geophysical interpretation.The results show that favorable facies belts for the development of reservoirs are interbank area and bank in the platform as well as platform marginal reef flat.The rocks are dominated by bioherm limestone limestone,calcarenite and micritic limestone.In various kinds of reservoir space such as pores,holes and seams,the pores are mainly intergranular pores and dorsal foramen.In massive micro-throats and little fine throats,most of the throats are confined.As the average porosity is 1.16% and the average permeability is 0.5415×10-3μm2,the reservoirs are classified as extra low-porosity and extra low-permeability reservoirs.Seismic response displays the features of low frequency,weak amplitude and chaotic seismic reflection.The well-logs for the gas reservoirs exhibit the properties of high neutron porosity,low density and low resistance.
Located in the ramp region between the Central Sichuan uplift and Northern Sichuan depression,the Langzhong-Nanbu area possesses superior accumulation conditions.The reservoir characteristics of the Changxing Formation in the study area were studied by means of core observation,debris description,microscopic observation of cast thin sections,analysis of mercury intrusion and geophysical interpretation.The results show that favorable facies belts for the development of reservoirs are interbank area and bank in the platform as well as platform marginal reef flat.The rocks are dominated by bioherm limestone limestone,calcarenite and micritic limestone.In various kinds of reservoir space such as pores,holes and seams,the pores are mainly intergranular pores and dorsal foramen.In massive micro-throats and little fine throats,most of the throats are confined.As the average porosity is 1.16% and the average permeability is 0.5415×10-3μm2,the reservoirs are classified as extra low-porosity and extra low-permeability reservoirs.Seismic response displays the features of low frequency,weak amplitude and chaotic seismic reflection.The well-logs for the gas reservoirs exhibit the properties of high neutron porosity,low density and low resistance.
引文
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[2]黄恒铨.川北大安寨段成岩作用与储集性能的关系[J].石油实验地质,1989,11(1):62-74.Huang Hengquan.Relationship between diagenesis and reservoirproperties in Da’anzhai Member,Northern Sichuan[J].PetroleumGeology&Experiment,1989,11(1):62-74(in Chinese withEnglish abstract).
[3]马永生,郭旭升,郭彤楼,等.四川盆地普光大型气田的发现与勘探启示[J].地质论评,2005,51(4):477-480.Ma Yongsheng,Guo Xusheng,Guo Tonglou,et al.Discovery ofthe large-scale Puguang gas field in the Sichuan Basin and itsenlightenent for hydrocarbon prospecting[J].Geological Review,2005,51(4):477-480(in Chinese with English abstract).
[4]黎从军.川北柏垭地区大安寨一亚段储渗流体特征及油气分布[J].石油与天然气地质,2002,23(1):81-83.Li Congjun.Oil-gas prediction and characteristics of reservoirsbodies for Da'anzhai-1 Submember in Baiya of North Sichuan[J].Oil&Gas Geology,2002,23(1):81-83(in Chinese with Englishabstract).
[5]操成杰,周新桂,舒能益,等.川北阆中地区大安寨段构造应力场与油气成藏预测.地质力学学报,2004,10(2):179-187.Cao Chengjie,Zhou Xingui,Shu Nengyi,et al.Tectonic StressField in the Da’anzhai Member of the Langzhong Area,NorthernSichuan,and forecast of petroleum accumulations[J].Journal ofGeomechanics,2004,10(2),179-187(in Chinese with Englishabstract).
[6]杨志彬,何祖荣,杨先利,等.川北阆中-南部地区大安寨段油气藏储层酸压改造技术及实践[J].中外能源,2010,15(5):50-52Yang Zhibin,He Zurong,Yang Xianli,et al.Acid frac process andpractice in Da’anzhai oil and gas reservoirs of Langzhong-Nanbuareas of Northern Sichuan[J].China Foreign Energy,2010,15(5):50-52(in Chinese with English abstract).
[7]陈汉军,吴亚军.川北阆中-南部地区茅口组礁滩相储层预测[J].天然气工业,2008,28(11):22-25Chen Hanjun,Wu Yajun.Prediction of reef and shoal faciesreservoirs in Maokou Formation of Langzhong-Nanbu areas inNorthern Sichuan Basin[J].Natural Gas Industry,2008(11):22-25(in Chinese).
[8]倪新锋,陈洪德,韦东晓.礁滩复合型气藏物质聚集分布及储层特征研究——以川东北地区普光气田长兴组—飞仙关组为例[J].中国地质,2007,34(6):1045-1054.Ni Xinfeng,Chen Hongde,Wei Dongxiao.Distribution andaccumulation of materials in shoal-reef compound gas deposits andreservoir characteristics——A case study of the Changxing-Feixianguan Formations in the Puguang gas field,northeasternSichuan[J].Geology in China,2007,34(6):1045-1054(inChinese with English abstract).
[9]蒋志斌,王兴志,张帆,等.四川盆地北部长兴组—飞仙关组礁、滩分布及其控制因素[J].中国地质,2008,35(5):940-950.Jiang Zhibin,Wang Xingzhi,Zhang Fan,et al.Distribution andcontrolling factors of reefs and oolitic beaches for the Changxing toFeixianguan formations in the northern Sichuan basin[J].Geology inChina,2008,35(5):940-950(in Chinese with English abstract).
[10]李登华,唐跃,殷积峰,等.川东黄龙场构造上二叠统长兴组生物礁特征与潜伏礁预测[J].中国地质,2006,33(2):427-435.Li Denghua,Tang Yue,Yin Jifeng,et al.Features of organic reefsin the Upper Permian Changxing Formation and prediction ofhidden reefs in the Huanglongchang structure,eastern Sichuan[J].Geology in China,2006,33(2):427-435(in Chinese with Englishabstract).
[11]陈洪德,钟怡江,侯明才,等.川东北地区长兴组—飞仙关组碳酸盐岩台地层序充填结构及成藏效应[J].石油与天然气地质,2009,30(5):539-547.Chen Hongde,Zhong Yijiang,Hou Mingcai,et al.Sequencestyles and hydrocarbon accumulation effects of carbonate rockplatform in the Changxing-Feixianguan formations in thenortheastern Sichuan Basin[J].Oil and Gas geology,2009,30(5):539-547(in Chinese with English abstract).
[12]袁洪,赵黔荣,孔德秋,等.阆中—元坝地区海相成藏条件研究[R].成都:中国石化西南油气分公司,2010.Yuan Hong,Zhao Qianrong,Kong Deqiu,et al.Study of theMarine Hydrocarbon Accumulation Conditions in Langzhong-Yuanba Region[R].Chengdu:Research Institute of Explorationand Development,Southwest Branch,Sinopec,2010(in Chinese).
[13]陶洪兴,等.中国油气储层研究图集.卷2.碳酸盐岩[M].北京:石油工业出版社,1994:98-99Tao Hongxing,et al.Atlas of Chinese Oil and Gas ReservoirsResearch.Volume2.Carbonate[M].Beijing:Petroleum IndustryPress,1994:98-99(in Chinese).
[14]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):101-109Jiang Zhibin,Wang Xingzhi,Zeng Demin,et al.Constructivediagenesis and porosity evolution in the Lower Permian QixiaFormation of Northwest Sichuan[J].Geology in China,2009,36(1):101-109(in Chinese with English abstract).
[15]杨威,魏国齐,金惠,等.川东北飞仙关组鲕滩储层成岩作用和孔隙演化Ⅱ].中国地质,2007,34(5):822—828.Yang Wei,Wei Guoqi,Jin Hui,et al.Diagenesis and poreevolution of the oolitic shoal reservoir in the FeixianguanFormation in Northeastern Sichuan[J].Geology in China,2007,34(5):815-821(in Chinese with English abstract).
[16]杨通佑.石油及天然气储量计算方法[M].北京:石油工业出版社,1998:98-105Yang Tongyou.Calculation of Oil and Natural Gas Reserves[M].Beijing:Petroleum Industry Press,1998:98-105(in Chinese).
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