川东南地区林1井震旦系灯影组电子探针分析:热液白云岩化过程中的元素变化
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摘要
以电子探针分析为主要研究方法,结合白云岩岩石学特征对四川盆地东南地区林1井上震旦统灯影组热液白云岩进行了研究。其特征表现为基质白云岩晶体较小,中-巨晶鞍形白云石充填溶蚀孔洞和裂缝。鞍形白云石晶体上常发育数条由内到外铁元素含量依次降低的明亮条带,表明其受到多期次的深部热液侵入的影响。通过对电子探针样品的分析,发现在热液白云石形成过程中,Mg~(2+)取代Ca~(2+)的同时伴随Fe~(2+)、Mn~(2+)、Sr~(2+)参与结晶。热液白云岩刚开始沉淀时,热液中的Fe~(2+)与Mn~(2+)进入原岩,随着Mg离子大量取代Ca~(2+),使Fe~(2+)与Mn~(2+)进入率下降;或是前期热液白云石的沉淀大量消耗了热液中的金属Fe~(2+)和Mn~(2+),导致金属离子供应不足,造成沉淀过程中Fe~(2+)与Mn~(2+)含量随着Mg~(2+)含量增加而减少,反映着热液白云岩化过程的流体改造进程。
Taking the electronic microprobe analysis as the main research method,comprehensive petrological characteristics of hydrothermal dolomite are studied in detail on the Permian Sinian Dengying Formation of the Well Lin-1 in the southeastern Sichuan Basin.The Dengying Formation dolomite is characterized by crystallitic matrix with medium-coarse grain sized saddle dolomite filled within pores,cavities and cracks.The saddle dolomite crystals contain several to more than ten growth strips with iron content decrease from the inner outside,which indicates that the growth of the saddle dolomite was influenced by multiple inputs of deep hydrothermal fluids.The results of the electron probe analysis suggest that Mg~(2+)could replace Ca~(2+),accompanying with the participation of Fe~(2+),Mn~(2+)and Sr~(2+)in the formation of hydrothermal dolomite.At the beginning of the hydrothermal dolomite formation,Fe~(2+)and Mn~(2+)in the hydrothermal fluids could replace Ca~(2+)in the original rock.When a large amount of Mg~(2+)replaced Ca~(2+),resulting in the declining rate of Fe~(2+)and Mn~(2+)into the dolomite.Thus,the early hydrothermal dolomite consumed a large number of Fe~(2+)and Mn~(2+)from the fluids,resulting in an inadequate supply of metal ions,e.g.,Fe~(2+),Mn~(2+),etc.,and in turn decrease Fe~(2+)and Mn~(2+)content with increasing Mg~(2+).
Taking the electronic microprobe analysis as the main research method,comprehensive petrological characteristics of hydrothermal dolomite are studied in detail on the Permian Sinian Dengying Formation of the Well Lin-1 in the southeastern Sichuan Basin.The Dengying Formation dolomite is characterized by crystallitic matrix with medium-coarse grain sized saddle dolomite filled within pores,cavities and cracks.The saddle dolomite crystals contain several to more than ten growth strips with iron content decrease from the inner outside,which indicates that the growth of the saddle dolomite was influenced by multiple inputs of deep hydrothermal fluids.The results of the electron probe analysis suggest that Mg~(2+)could replace Ca~(2+),accompanying with the participation of Fe~(2+),Mn~(2+)and Sr~(2+)in the formation of hydrothermal dolomite.At the beginning of the hydrothermal dolomite formation,Fe~(2+)and Mn~(2+)in the hydrothermal fluids could replace Ca~(2+)in the original rock.When a large amount of Mg~(2+)replaced Ca~(2+),resulting in the declining rate of Fe~(2+)and Mn~(2+)into the dolomite.Thus,the early hydrothermal dolomite consumed a large number of Fe~(2+)and Mn~(2+)from the fluids,resulting in an inadequate supply of metal ions,e.g.,Fe~(2+),Mn~(2+),etc.,and in turn decrease Fe~(2+)and Mn~(2+)content with increasing Mg~(2+).
引文
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Lonnee J,Machel H G.2006.Pervasive dolomitization with subsequent hydrothermal alteration in the Clarke Lake gas field,middle devonian slave point formation,British Columbia,Canada.AAPGBulletin,90(11):1739-1761
Machel H G.1987.Saddle dolomite as a by-product of chemical compaction and thermo-chemical sulfate reduction.Geology,15(10):936-940
Machel H G,Lonnee J.2002.Hydrothermal dolomite-a product of poor definition and imagination.Sedimentary Geology,152(3-4):163-171
Smith L B,Davies G R.2006.Structurally controlled hydrothermal alteration of carbonate reservoirs:Introduction.AAPG Bulletin,90(11):1635-1640
White D E.1957.Thermal water of volcanic origin.Geological Society of America Bulletin.68:1637-1658
陈代钊.2008.构造-热液白云岩化作用与白云岩储集层.石油与天然气地质,29(5):614-622
贵州108地质队.1978.相梓幅H-48-35 1/20万区域地质调查报告,68-69
黄思静,胡作维,钟怡江,黄可可,李小宁.2015.四川盆地二叠-三叠系碳酸盐岩和砂岩中的鞍形白云石:岩石学、形成温度与流体.成都理工大学学报(自然科学版),42(2):129-148
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金之钧,朱东亚,胡文瑄,张学丰,王毅,闫相宾.2006.塔里木盆地热液活动地质地球化学特征及其对储集层影响.地质学报,80(2):245-253
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刘树根,马永生,蔡勋育,徐国盛,王国芝,雍自权,孙玮,袁海锋,盘昌林.2009.四川盆地震旦系-下古生界天然气成藏过程和特征.成都理工大学学报(自然科学版),36(4):345-354
彭俊.2010.川东南地区震旦系灯影组储集层特征研究.硕士学位论文.成都:成都理工大学:1-60
施泽进,王勇,田亚铭,王长城.2013.四川盆地东南部震旦系灯影组藻云岩胶结作用及其成岩流体分析.中国科学:地球科学,43(2):317-328
宋光永,刘树根,黄文明,王国芝,陈翠华,马文辛,张长俊.2009.川东南丁山-林滩场构造灯影组热液白云岩特征.成都理工大学学报(自然科学版),36(6):706-715
宋光永.2010.川东南地区上震旦统灯影组热液白云岩特征.硕士学位论文.成都:成都理工大学:1-99
宋光永,刘树根,李森明,王鹏程.2011.四川盆地东南地区林1井灯影组鞍形白云石成因及其意义.海相油气地质,16(2):53-60
宋金民,刘树根,孙玮,武文慧,王国芝,彭瀚霖,田艳红,钟勇.2013.兴凯地裂运动对四川盆地灯影组优质储集层的控制作用.成都理工大学学报(自然科学版),40(6):658-670
孙玮,刘树根,韩克猷,罗志立,王国芝,徐国盛.2009.四川盆地震旦系油气地质条件及勘探前景分析.石油实验地质,31(4):350-355
王东.2009.川东南桑木场-酒店垭构造形成演化与多期流体充注.硕士学位论文.成都:成都理工大学:1-98
张杰,沈安江,张天付,寿建峰.2012.鞍状白云石晶体结构特征及其对热液白云岩储集层研究的意义.见:中国晶体学会第五次全国会员代表大会暨学术年会论文集.西安:中国晶体学会
钟大赉,马福臣,钟嘉猷.1983.川南地区燕山期复合构造的历史分析和力学分析.见:张文佑.断块构造文集.北京:科学出版社:17-23
Davies G R,Smith L B.2006.Structurally controlled hydrothermal dolomite reservoir facies:An overview.AAPG Bulletin,90(11):1641-1690
Gregg J M.1883.On the formation and occurrence of saddle dolomite:Discussion.Journal of Sedimentary Petrology,53(3):1025-1026
Hanor J S.1994.Origin of saline fluids in sedimentary basins.In:Parnell J,ed.Geofluids:Origin and Migration of Fluids in Sedimentary Basins.London:Geological Society Special Publication,78:151-174
Kretz R.1992.Carousel model for the crystallization of saddle dolomite.Journal of Sedimentary Petrology,62(2):190-195
Lonnee J,Machel H G.2006.Pervasive dolomitization with subsequent hydrothermal alteration in the Clarke Lake gas field,middle devonian slave point formation,British Columbia,Canada.AAPGBulletin,90(11):1739-1761
Machel H G.1987.Saddle dolomite as a by-product of chemical compaction and thermo-chemical sulfate reduction.Geology,15(10):936-940
Machel H G,Lonnee J.2002.Hydrothermal dolomite-a product of poor definition and imagination.Sedimentary Geology,152(3-4):163-171
Smith L B,Davies G R.2006.Structurally controlled hydrothermal alteration of carbonate reservoirs:Introduction.AAPG Bulletin,90(11):1635-1640
White D E.1957.Thermal water of volcanic origin.Geological Society of America Bulletin.68:1637-1658
陈代钊.2008.构造-热液白云岩化作用与白云岩储集层.石油与天然气地质,29(5):614-622
贵州108地质队.1978.相梓幅H-48-35 1/20万区域地质调查报告,68-69
黄思静,胡作维,钟怡江,黄可可,李小宁.2015.四川盆地二叠-三叠系碳酸盐岩和砂岩中的鞍形白云石:岩石学、形成温度与流体.成都理工大学学报(自然科学版),42(2):129-148
黄文明.2008.四川盆地震旦系储集层特征及其形成机制研究.硕士学位论文.成都:成都理工大学:1-127
金之钧,朱东亚,胡文瑄,张学丰,王毅,闫相宾.2006.塔里木盆地热液活动地质地球化学特征及其对储集层影响.地质学报,80(2):245-253
刘树根,马永生,黄文明,蔡勋育,张长俊,王国芝,徐国盛,雍自权,盘昌林.2007.四川盆地上震旦统灯影组储集层致密化过程研究.天然气地球科学,18(4):485-496
刘树根,黄文明,陈翠华,张长俊,李巨初,戴苏兰,秦川.2008.四川盆地震旦系-古生界热液作用及其成藏成矿效应初探.矿物岩石,28(3):41-50
刘树根,马永生,蔡勋育,徐国盛,王国芝,雍自权,孙玮,袁海锋,盘昌林.2009.四川盆地震旦系-下古生界天然气成藏过程和特征.成都理工大学学报(自然科学版),36(4):345-354
彭俊.2010.川东南地区震旦系灯影组储集层特征研究.硕士学位论文.成都:成都理工大学:1-60
施泽进,王勇,田亚铭,王长城.2013.四川盆地东南部震旦系灯影组藻云岩胶结作用及其成岩流体分析.中国科学:地球科学,43(2):317-328
宋光永,刘树根,黄文明,王国芝,陈翠华,马文辛,张长俊.2009.川东南丁山-林滩场构造灯影组热液白云岩特征.成都理工大学学报(自然科学版),36(6):706-715
宋光永.2010.川东南地区上震旦统灯影组热液白云岩特征.硕士学位论文.成都:成都理工大学:1-99
宋光永,刘树根,李森明,王鹏程.2011.四川盆地东南地区林1井灯影组鞍形白云石成因及其意义.海相油气地质,16(2):53-60
宋金民,刘树根,孙玮,武文慧,王国芝,彭瀚霖,田艳红,钟勇.2013.兴凯地裂运动对四川盆地灯影组优质储集层的控制作用.成都理工大学学报(自然科学版),40(6):658-670
孙玮,刘树根,韩克猷,罗志立,王国芝,徐国盛.2009.四川盆地震旦系油气地质条件及勘探前景分析.石油实验地质,31(4):350-355
王东.2009.川东南桑木场-酒店垭构造形成演化与多期流体充注.硕士学位论文.成都:成都理工大学:1-98
张杰,沈安江,张天付,寿建峰.2012.鞍状白云石晶体结构特征及其对热液白云岩储集层研究的意义.见:中国晶体学会第五次全国会员代表大会暨学术年会论文集.西安:中国晶体学会
钟大赉,马福臣,钟嘉猷.1983.川南地区燕山期复合构造的历史分析和力学分析.见:张文佑.断块构造文集.北京:科学出版社:17-23