松辽盆地宋站南地区中浅层天然气来源与成藏条件
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摘要
宋站南地区位于榆树林油田北部,区域构造上位于松辽盆地中央坳陷区三肇凹陷的东北斜坡带,西邻升平构造,北与宋站鼻状构造接壤,东部为尚家鼻状构造,南部为徐家围子构造群。从目前的勘探开发现状来看,已经在周边地区葡萄花油层和扶杨油层发现有汪家屯气田、升平油田、榆树林油田、宋站气田。但是,宋站南核心地区油气富集的基础地质条件、油气来源、成藏条件等认识不清。因此,对宋站南地区的研究是十分有必要的。
天然气组分和同位素是判别天然气成因的主要依据,也是天然气仅有的两种地化数据。本文通过对宋南地区天然气的甲烷,重烃,非烃及碳同位素等方面进行对比研究,得出宋南地区中浅层天然气与升平地区中浅层天然气是同源的,而且含有无机气,但含量很少。通过对升平地区中浅层天然气和升平地区深层天然气对比分析得出,升平地区中浅层天然气与深层同源。对升平深层烃源岩分析可知,升平深层天然气主要来自沙河子组煤系源岩。即宋站南中浅层天然气(扶杨油层及登娄库组天然气)气源岩为沙河子组煤系源岩。研究区中浅层钻探过程中发现的主要的产油层位是:葡萄花、扶余、杨大城子油层。葡萄花油层储层主要是水下分流河道砂、砂坝和席状砂,以中孔中渗为主。扶杨油层储层主要为河道砂和砂坝,以中-低孔、特低-低-非渗储层为主。本区中浅层天然气主要运移输导通道是断陷期形成坳陷期继续活动的断裂(T5(T4)-T2断裂)及断陷期形成坳陷期和构造反转期活动的断裂(T5(T4)-T06),这些断裂沟通了下伏沙河子组有效源岩与中浅层地层的有效圈闭,在泉头组-青山口组沉积时期,松辽盆地受到东西向拉张应力场作用,这些断裂活动开启,而此时下伏的沙河子组气源岩已进入大量的排气期,其生成的天然气沿源断裂向上运移进入中浅层的储层中聚集成藏。宋站南地区葡萄花油层和扶杨油层均以断块圈闭为主。对研究区扶杨油层断裂带中泥质含量进行计算,并以泥质含量50%为界评价了该区断裂的侧向封闭性。可以看出,宋站南地区扶杨油层断层侧向封闭性好,由其控制形成的断块和断层遮挡圈闭均是有效的。
The South of Songzhan is on the northern of Yushulin oil field,it is located in the Northeast slope of Central Depression of SongliaoBasin-Sanzhao Depression,next to Shengping Construction in the West,Songzhan Nose-like structure in the North,Shangjia Nose-like structure in the East,Xujiaweizi Construction Group in the Sorth.at the present, Shengping, Wangjiatun,Songzhan,Yushulin,Shangjia oil and gas field in Putaohua and Fuyang oil layers in the mid-shallow formation of Sanzhao have been found around Study area,however,at the present,the exploration in South Songzhan is still relatively low,geological understanding of a very shallow,the prospects for oil and gas resources not very clear.
Chemical composition and isotopic composition which are the only Geochemical data of natural gas are the main causes when it comes to the origin of natural gas.Based on methane,heavy hydrocarbons,non-hydrocarbon and carbon isotopes and other aspects of comparative study on natural gas,we have reached the conclution that natural gas in the shallow part of Song Nan is homologous that in Shengping region and they both contion but little inorganic gas.baseed on the analysis and comparation of natural gas in shallow and deep part of Shengping area ,it is concluted that natural gas, weather shallow or deep source,enjoy the same origion.through the study of source rocks in deep part in Shengping region,we arrived the conclution that deep natural gas in Shengping region mainly from sub-group of Shahe. So natural gas in shallow and Moderate part of Song Nan mainly from sub-group of Shahe. Shallow and Moderate part of Song Nan mainly oil floors are Putaohua and Fuyang oil layers.Putaohua reservoir is mainly underwater distributary channel sand, sand dams,and I like sand to the hole in the main penetration. Fuyang reservoir main dam for the river sand and sand to the middle-low porosity and ultra-low-low-mainly the non-permeability reservoirs.the main migration conduit channel of natural gas in shallow and Moderate part of Song Nan is faulted period of depression a view to continuing the activities of the formation of the fractureand Period of the formation of rift tectonic inversion phase Depression period and the activities of the fracture.These faults of the underlying communication sub-group of Shahe valid source rocks and traps in the shallow strata of the effective. Putaohua and Fuyang oil layers in this area mainly are by fault block trap primarily.
天然气组分和同位素是判别天然气成因的主要依据,也是天然气仅有的两种地化数据。本文通过对宋南地区天然气的甲烷,重烃,非烃及碳同位素等方面进行对比研究,得出宋南地区中浅层天然气与升平地区中浅层天然气是同源的,而且含有无机气,但含量很少。通过对升平地区中浅层天然气和升平地区深层天然气对比分析得出,升平地区中浅层天然气与深层同源。对升平深层烃源岩分析可知,升平深层天然气主要来自沙河子组煤系源岩。即宋站南中浅层天然气(扶杨油层及登娄库组天然气)气源岩为沙河子组煤系源岩。研究区中浅层钻探过程中发现的主要的产油层位是:葡萄花、扶余、杨大城子油层。葡萄花油层储层主要是水下分流河道砂、砂坝和席状砂,以中孔中渗为主。扶杨油层储层主要为河道砂和砂坝,以中-低孔、特低-低-非渗储层为主。本区中浅层天然气主要运移输导通道是断陷期形成坳陷期继续活动的断裂(T5(T4)-T2断裂)及断陷期形成坳陷期和构造反转期活动的断裂(T5(T4)-T06),这些断裂沟通了下伏沙河子组有效源岩与中浅层地层的有效圈闭,在泉头组-青山口组沉积时期,松辽盆地受到东西向拉张应力场作用,这些断裂活动开启,而此时下伏的沙河子组气源岩已进入大量的排气期,其生成的天然气沿源断裂向上运移进入中浅层的储层中聚集成藏。宋站南地区葡萄花油层和扶杨油层均以断块圈闭为主。对研究区扶杨油层断裂带中泥质含量进行计算,并以泥质含量50%为界评价了该区断裂的侧向封闭性。可以看出,宋站南地区扶杨油层断层侧向封闭性好,由其控制形成的断块和断层遮挡圈闭均是有效的。
The South of Songzhan is on the northern of Yushulin oil field,it is located in the Northeast slope of Central Depression of SongliaoBasin-Sanzhao Depression,next to Shengping Construction in the West,Songzhan Nose-like structure in the North,Shangjia Nose-like structure in the East,Xujiaweizi Construction Group in the Sorth.at the present, Shengping, Wangjiatun,Songzhan,Yushulin,Shangjia oil and gas field in Putaohua and Fuyang oil layers in the mid-shallow formation of Sanzhao have been found around Study area,however,at the present,the exploration in South Songzhan is still relatively low,geological understanding of a very shallow,the prospects for oil and gas resources not very clear.
Chemical composition and isotopic composition which are the only Geochemical data of natural gas are the main causes when it comes to the origin of natural gas.Based on methane,heavy hydrocarbons,non-hydrocarbon and carbon isotopes and other aspects of comparative study on natural gas,we have reached the conclution that natural gas in the shallow part of Song Nan is homologous that in Shengping region and they both contion but little inorganic gas.baseed on the analysis and comparation of natural gas in shallow and deep part of Shengping area ,it is concluted that natural gas, weather shallow or deep source,enjoy the same origion.through the study of source rocks in deep part in Shengping region,we arrived the conclution that deep natural gas in Shengping region mainly from sub-group of Shahe. So natural gas in shallow and Moderate part of Song Nan mainly from sub-group of Shahe. Shallow and Moderate part of Song Nan mainly oil floors are Putaohua and Fuyang oil layers.Putaohua reservoir is mainly underwater distributary channel sand, sand dams,and I like sand to the hole in the main penetration. Fuyang reservoir main dam for the river sand and sand to the middle-low porosity and ultra-low-low-mainly the non-permeability reservoirs.the main migration conduit channel of natural gas in shallow and Moderate part of Song Nan is faulted period of depression a view to continuing the activities of the formation of the fractureand Period of the formation of rift tectonic inversion phase Depression period and the activities of the fracture.These faults of the underlying communication sub-group of Shahe valid source rocks and traps in the shallow strata of the effective. Putaohua and Fuyang oil layers in this area mainly are by fault block trap primarily.
引文
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[2]张枝焕,曾艳涛等.渤海湾盆地沾化凹陷渤南洼陷原油地球化学特征及成藏期分析[J].石油实验地质,2006,28(1):55~58.
[3]申家年,邓冰等.齐家古龙凹陷凝析油气的地球化学剖析与油源对比[J].地球化学,2007.
[4]黄福堂,冯子辉.松辽盆地王府凹陷油气水地化化特征与油藏对比[J].石油勘探与开发,1996,23(6):28~33.
[5]霍秋立,冯子辉.三肇凹陷低成熟原油地球化学特征及成因探讨[J].大庆石油地质与开发,1995,14(4):6~11.
[6]李景坤,刘伟,宋兰斌.徐家围子断陷深层烃源岩生烃条件研究[J].天然气工业.2006,26(6):21~24.
[7]张家栋,关德范.对三肇凹陷油气聚集及控制因素的几点认识[J].大庆石油学院学报,1982,(3):61~70.
[8]薛永超,付广等.三肇地区登娄库组天然气成藏过程[J].大庆石油地质与开发,2004,23(3):3~5.
[9]谭保祥,候德艳等.三肇地区扶杨油层油气气藏分布规律及勘探前景分析[J].石油勘探与开发,1995,22(1):1~5.
[10]姜振学,付广.三肇地区扶余油层油气运移形式及供油气单元特征[J].天然气工业,1994,14(6):24~28.
[11]薛永超,付广等.三肇地区深层天然气成藏模式初步研究[J].中国海上油气(地质),2003,17(5):298~232.
[12]付广,吕延防等.泥岩盖层封气性演化阶段及其研究意义[J].中国海上油气(地质) ,2001,15(2):14~152.
[13]高瑞祺,蔡希源.松辽盆地油气田形成条件与分布规律[M].北京:石油工业出版社,1997,104~180.
[14]邹才能,贾承造,赵文智等.松辽盆地南部岩性-地层油气成藏动力和分布规律[J].石油勘探与开发,2005,32(4):125~130.
[15]付广,张云峰,杜春国.松辽盆地北部岩性油藏成藏机制及主控因素[J].石油勘探与开发,2002,29(5):22~24.
[16]杨喜贵,付广.松辽盆地北部扶杨油层油气成藏与分布的主控因素[J].特种油气藏,2002,9(2):8~11.
[17]蒙启安,黄薇,林铁峰.松辽盆地北部岩性油藏形成条件与分布规律[J].中国石油勘探,2004,(4):6~11.
[18]任延广.2004,松辽盆地徐家围子断陷地质特征与天然气聚集规律[D].吉林大学博士学位论文.61~76.
[19]霍秋立.2007,松辽盆地徐家围子断陷深层天然气来源与成藏研究[D].大庆石油学院博士学位论文,3~45.
[20]卢双舫,李吉君,薛海涛,等.油成甲烷碳同位素分馏的化学动力学及其初步应用[J].吉林大学学报(地球科学版),2006,36(5):825~829.
[21]帅燕华,邹艳荣,彭平安.天然气甲烷碳同位素动力学模型与地质应用新近展[J].地球科学进展,2003,18(3):405~411.
[22]邹艳荣,帅燕华,孔枫,等.煤成甲烷碳同位素演化的数学模型与应用[J].天然气地球科学,2003,14(2):92~96.
[23]关平,伍天洪.热成因甲烷碳同位素分布的形成机制[J].沉积学报,2003,21(1):175~182.
[24]史基安,卢龙飞,王金鹏,等.天然气运移物理模拟实验及其结果[J].天然气工业,2004,24(12):32～34.
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