溱潼凹陷火山岩油藏成藏特征研究
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摘要
近年来,苏北盆地火山岩油藏勘探取得一系列成果,但针对火山岩分布、岩相及油藏成藏特征研究较少。本文在井震结合的基础上,充分应用岩心、薄片、物性分析等资料,尝试系统研究溱潼凹陷火山岩岩相模式,总结油藏类型,分析勘探潜力。溱潼凹陷火山岩沿深大断裂呈中心式喷发,喷发期次单一,主要形成于渐新世三垛运动期,主要发育火山通道相和溢流相。火山通道相的次火山岩亚相和隐爆角砾岩亚相主要分布在阜二段—戴南组,其中次火山岩亚相分布最为广泛;溢流相的玄武岩主要分布在垛一段顶部,是一套区域性标志层。溱潼凹陷新生代火山岩油藏主要发育3种类型:隐爆角砾岩型、接触蚀变型、侧向遮挡型,并建立了5种火山岩油藏成藏模式。火山岩油藏富集受火山岩形成时间、规模、岩性等因素影响。火山作用既能催熟烃源岩,又有利于砂岩储层形成裂缝,溱潼凹陷火山活动主要对油气成藏起促进作用。未震穿阜四段泥岩的隐爆角砾岩体具有更有利的成藏组合。针对不同类型火山岩油藏勘探均取得一定成果。在茅山—帅垛—储家楼地区共发育12个火山口,118km2侵入岩,预计3种类型火山岩油藏资源量1500×104 t,是溱潼凹陷重要的资源接替领域。
Volcanic rocks are widespread in Subei basin,recently industrial oil run is obtained in basalt of Jinghu depression,diabase of Gaoyou depression and volcanic vent of Qintong depression.Based on logging information and seismic material,combined with core,slice and physical property analysis,the accumulation characteristics and exploration potential of volcanic reservoir of Qintong depression were studied.The results indicated that:volcanic rocks present central type eruption along with deep fracture,which were formed in Sanduo Movement of Oligocene,volcanic vent facies and overflow facies were developed.Subvolcanic rock subfacies and cryptoexplosive breccia subfacies that belong to volcanic vent facies are distributed among Ef2-Ed1,while subvolcanic rock subfacies are more widespread.Basalts that belong to overflow facies were distributed on the top of Es1,which was a marker bed that used for stratigraphic correlation.Cryptoexplosive breccia type,contact alteration and lateral barrier type reservoir were developed in Cenozoic strata,meanwhile five accumulation models were built up.Accumulation of volcanic reservoir is controlled by development time,scale and lithology.Volcanism is not only benefit acceleration of source rock maturation,but also avail the formation of crack for sandstone,therefore volcanism play a driving role in hydrocarbon accumulation.Cryptoexplosive breccia bodies that did not break mudstones of Ef4 possess more favorable reservoir formation combination.Certain effects were obtained in the exploration of different volcanic reservoir.12 volcanic vent and 160 square kilometers intrusive rock were developed in Maoshen-Shuaiduo-Chujialou region,estimated resources about 1500×104 t are important for reservoir exploration of Qintong depression.
Volcanic rocks are widespread in Subei basin,recently industrial oil run is obtained in basalt of Jinghu depression,diabase of Gaoyou depression and volcanic vent of Qintong depression.Based on logging information and seismic material,combined with core,slice and physical property analysis,the accumulation characteristics and exploration potential of volcanic reservoir of Qintong depression were studied.The results indicated that:volcanic rocks present central type eruption along with deep fracture,which were formed in Sanduo Movement of Oligocene,volcanic vent facies and overflow facies were developed.Subvolcanic rock subfacies and cryptoexplosive breccia subfacies that belong to volcanic vent facies are distributed among Ef2-Ed1,while subvolcanic rock subfacies are more widespread.Basalts that belong to overflow facies were distributed on the top of Es1,which was a marker bed that used for stratigraphic correlation.Cryptoexplosive breccia type,contact alteration and lateral barrier type reservoir were developed in Cenozoic strata,meanwhile five accumulation models were built up.Accumulation of volcanic reservoir is controlled by development time,scale and lithology.Volcanism is not only benefit acceleration of source rock maturation,but also avail the formation of crack for sandstone,therefore volcanism play a driving role in hydrocarbon accumulation.Cryptoexplosive breccia bodies that did not break mudstones of Ef4 possess more favorable reservoir formation combination.Certain effects were obtained in the exploration of different volcanic reservoir.12 volcanic vent and 160 square kilometers intrusive rock were developed in Maoshen-Shuaiduo-Chujialou region,estimated resources about 1500×104 t are important for reservoir exploration of Qintong depression.
引文
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[21]李春光.东营、惠民凹陷与火山岩相关的油气藏[J].勘探家,1997,2(1):29-32.
[22]李亚辉.高邮凹陷北斜坡辉绿岩与油气成藏[J].地质力学学报,2000,6(2):17-22.
[2]魏兆胜,李迎九.长岭气田营城组火山岩气藏开发的阶段性思考[J].非常规油气,2015,3(3):78-82.
[3]叶绍东,任红民,李储华,等.苏北盆地新生代侵入岩分布特征及地质意义[J].地质论评,2010,56(2):269-274.
[4]杨新明.金湖凹陷火山岩断块油藏地质特征与开发规律[J].石油天然气学报,2010,32(1):177-179.
[5]昝灵,骆卫峰,马晓东.苏北盆地溱潼凹陷阜二段烃源岩生烃潜力及形成环境[J].非常规油气,2016,3(3):1-8.
[6]姚洪生,张勇,蒋永平,等.苏北盆地溱潼凹陷新生代侵入岩蚀变带油藏地质特征[J].石油实验地质,2014,36(2):153-159.
[7]邱海峻,许志琴,乔德武.苏北盆地构造演化研究进展[J].地质通报,2006,25(9-10):1117-1120.
[8]吴向阳,牟荣,石胜群,等.苏北盆地火成岩发育与构造演化的关系[J].勘探家,1999,4(1):44-47.
[9]毛凤鸣.高邮凹陷北斜坡辉绿岩形成时期的确定[J].石油勘探与开发,2000,27(6):19-20.
[10]王璞珺,迟元林,刘万洙,等.松辽盆地火山岩相:类型、特征和储层意义[J].吉林大学学报(地球科学版),2003,33(4):449-456.
[11]李潮流,闫玉明.辽河东部凹陷火成岩地层测井响应特征研究[J].测井技术,2005,29(6):531-533.
[12]邵维志,梁巧峰,李俊国,等.黄骅凹陷火成岩储层测井响应特征研究[J].测井技术,2006,30(2):149-153.
[13]王军,刘小燕.高邮凹陷北斜坡辉绿岩区解释方法研究[J].石油物探,2004,43(2):163-166.
[14]王德滋,周新民.火山岩岩石学[M].北京:科学出版社,1982:1-244.
[15]吴昌志,顾连兴,任作伟,等.中国东部中、新生代含油气盆地火成岩油气藏成藏机制[J].地质学报,2005,79(4):522-530.
[16]吴昌志,顾连兴,任作伟,等.辽河油田欧利坨子潜火山岩及其成藏机制[J].地质论评,2003,49(2):162-16.
[17]李维华,刘明生,曾宪云.冀中廊固凹陷板岩油气藏勘探实践与认识[J].中国石油勘探,2001,6(2):20-22.
[18]梁宏斌,张舒亭,李清.冀中廊固凹陷火成岩成藏条件研究[J].特种油气藏,2003,10(1):82-85.
[19]宋梅远.渤南洼陷泥岩裂缝油气藏储层发育及成藏规律研究[D].青岛:中国石油大学(华东),2011:22-29.
[20]孙春友.苏北盆地海安凹陷阜宁组泰州组方沸石透辉石角岩储层特征[J].石油勘探与开发,1991(2):89-94.
[21]李春光.东营、惠民凹陷与火山岩相关的油气藏[J].勘探家,1997,2(1):29-32.
[22]李亚辉.高邮凹陷北斜坡辉绿岩与油气成藏[J].地质力学学报,2000,6(2):17-22.