桂中坳陷岩心裂缝方解石脉流体包裹体分析及其地质意义
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摘要
对桂中坳陷DS1井岩心裂缝方解石脉体样品开展了流体包裹体均一温度测定和气体成分激光拉曼光谱分析以及岩石热声发射最高古地温测定,结果发现裂缝脉体流体包裹体均一温度范围在97~225℃,部分流体包裹体为含甲烷盐水包裹体;中泥盆统样品最高古地温约为210~240℃。结合DS1井一维地层埋藏—热演化成熟史模拟和裂缝方解石脉形成温度—深度及期次研究,表明在距今230 Ma时应堂组和东岗岭组一段碳酸盐岩地层热成熟度Ro达到3.0%~3.5%,处于高演化过成熟干气阶段;应堂组和东岗岭组一段裂缝方解石脉形成的深度约在4 000~7 500 m,形成的地质年龄在距今230—1 Ma。研究认为在距今230 Ma以来的印支期—喜山期地层抬升剥蚀过程中,发生了多期的裂缝方解石脉的形成和对保存条件的改造。由此推测印支期抬升剥蚀以来多期构造运动、多期次的裂缝形成及成脉古流体活动可能已对该区原有的天然气藏的保存条件造成了较大的影响。
This paper carries out the measurement of homogenization temperatures of fluid inclusions,Laser Raman spectroscopy analysis of gas composition within fluid inclusions and the determination of the highest paleotemperatures using rock thermal acoustic emission technology for the fracture calcite veins of conventional-core samples in DS1 well of Guizhong Depression. The studied results indicate that homogenization temperatures of fluid inclusions range from 97 ℃to 225 ℃,a part of gas-water two phase fluid inclusions are methane-containing fluid inclusions and the highest paleotemperatures of rock samples of Middle Devonian are 210 ~ 240 ℃. Combined with the one-dimensional modeling of burial and thermal maturity histories of DS1 well and the temperatures and depthes of formation of the fracture calcite veins in DS1 well,the values of vitrinite reflectance( Ro) for the thermal maturity of Yingtang and Donggangling Formations are3. 0% ~ 3. 5%,coincident with dry gas of over-maturity stage at the geological time of 230 Ma. The depthes and the geological ages of formation of the fracture calcite veins in Yingtang and Donggangling Formations were 4 000 ~ 7 500 m and230—1 Ma,respectively. It is considered that the fracture calcite veins were formed frequently and repeatedly in Desheng area of Guizhong Depression,suggesting that the reconstruction and significant impact of the preservation condition of original hydrocarbon gas reservoirs were occurred due to the tectonic fractures with paleo-fluid activities in the studied region during the uplift and erosion of Yanshan and Himalayan tectonic movement periods since 230 Ma.
This paper carries out the measurement of homogenization temperatures of fluid inclusions,Laser Raman spectroscopy analysis of gas composition within fluid inclusions and the determination of the highest paleotemperatures using rock thermal acoustic emission technology for the fracture calcite veins of conventional-core samples in DS1 well of Guizhong Depression. The studied results indicate that homogenization temperatures of fluid inclusions range from 97 ℃to 225 ℃,a part of gas-water two phase fluid inclusions are methane-containing fluid inclusions and the highest paleotemperatures of rock samples of Middle Devonian are 210 ~ 240 ℃. Combined with the one-dimensional modeling of burial and thermal maturity histories of DS1 well and the temperatures and depthes of formation of the fracture calcite veins in DS1 well,the values of vitrinite reflectance( Ro) for the thermal maturity of Yingtang and Donggangling Formations are3. 0% ~ 3. 5%,coincident with dry gas of over-maturity stage at the geological time of 230 Ma. The depthes and the geological ages of formation of the fracture calcite veins in Yingtang and Donggangling Formations were 4 000 ~ 7 500 m and230—1 Ma,respectively. It is considered that the fracture calcite veins were formed frequently and repeatedly in Desheng area of Guizhong Depression,suggesting that the reconstruction and significant impact of the preservation condition of original hydrocarbon gas reservoirs were occurred due to the tectonic fractures with paleo-fluid activities in the studied region during the uplift and erosion of Yanshan and Himalayan tectonic movement periods since 230 Ma.
引文
[1]林良彪,陈洪德,陈子炓,等.桂中坳陷中泥盆统烃源岩特征[J].天然气工业,2009,29(3):45-47.
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[15]Touray J C,Guilhaumou N.Characteriration of Ha S-bearing fluid inclusions[J].Bull mineral,1984,107:81-188.
[16]范坤,陈彬滔,于兴河,等.盆地模拟技术与Basin Mod软件应用[J].沉积与特提斯地质,2010,30(2):55-60.
[17]高玉巧,欧光习,谭守强.岐口凹陷西坡白水头构造段下部油气成藏期次研究[J].石油学报,2003,19(2):359-365.
[18]王建宝,郭汝泰,肖贤明.塔里木盆地轮南低隆起早古生代油气藏形成的期次与时间研究[J].沉积学报,2002,20(2):320-332.
[19]刘建明.沉积盆地动力学与盆地流体成矿[J].矿物岩石地球化学通报,2000,19(2):76-84.
[20]张俊武,邹华耀,李平平,等.含烃盐水包裹体PVT模拟新方法及其在气藏古压力恢复中的应用[J].石油实验地质,2015,37(1):102-108.
[21]高键,何生,何治亮,等.中扬子京山地区方解石脉成因及其对油气保存的指示意义[J].石油与天然气地质,2014,35(1):33-41.
[22]杨兴业,何生,何治亮,等.京山地区方解石脉包裹体、同位素特征及古流体指示意义[J].中国石油大学学报,2013,37(1):19-34.
[2]贺训云,姚根顺,贺晓苏,等.桂中坳陷桂中1井沥青成因及油气成藏模式[J].石油学报,2010,31(3):420-425.
[3]陈子炓,姚根顺,楼章华,等.桂中坳陷及周缘油气保存条件分析[J].中国矿业大学学报,2011,40(1):80-88.
[4]万梨,赵泽恒.大南盘江地区泥盆—二叠系生物礁(滩)储集特征及控制因素[J].复杂油气藏,2013,6(1):6-11.
[5]楼章华,尚长健,姚根顺,等.桂中坳陷及周缘海相地层油气保存条件[J].石油学报,2011,32(3):432-441.
[6]金爱民,尚长健,朱荣,等.桂中坳陷及周缘地下水化学—动力学特征与油气保存[J].中国矿业大学学报,2011,40(5):758-765.
[7]刘德汉,肖贤明,田辉,等.含油气盆地中的流体包裹体类型及其地质意义[J].石油与天然气地质,2008,29(4):491-501.
[8]潘立银,倪培,欧光习.油气包裹体在油气地质研究中的应用——概念、分类、形成机制及研究意义[J].矿物岩石地球化学通报,2006,25(1):19-28.
[9]谢增业,单秀琴,李剑.川东北飞仙关组包裹体特征及其在天然气成藏研究中的应用[J].矿物岩石地球化学通报,2006,25(1):49
[10]高键,何生,易积正.礁石坝页岩气田中高密度甲烷包裹体的发现及其意义[J].石油与天然气地质,2015,36(3):472-480.
[11]Rosasco G J,Roedder E.Applications of a new Raman microprobe spectrometer tonondestructive analysis of sulfate and other ions in individual phase in fluid inclusions in minerals[J].Geochim.Cosmochim.Acta,1979,43:1907-1915.
[12]Rosso K M and Bodnar R J.Microthermotric and Raman spectroscopic detection limits of CO2in fliud inclusions and the Raman spectroscopic characterization of CO2[J].Geochimica Cosmochimica Acta,1995,59(19):3963-3975.
[13]Dhamelincourt P,Beny J M,Dubessy J,Poty B.Analyse dinclusions fluides la microsonde MOLEreffect Raman[J].Bull.Mineral,1979,102:600-610.
[14]Beny C,Guilhaumou N,Tuoray J C.Native-suphurbearing fluid inclusions in the CO2-H2S-H2O-S system microthermometry and Raman microprobe(MOLE)analysis-thermochemical interpretations[J].Chemical Geology,1982,37:113-127.
[15]Touray J C,Guilhaumou N.Characteriration of Ha S-bearing fluid inclusions[J].Bull mineral,1984,107:81-188.
[16]范坤,陈彬滔,于兴河,等.盆地模拟技术与Basin Mod软件应用[J].沉积与特提斯地质,2010,30(2):55-60.
[17]高玉巧,欧光习,谭守强.岐口凹陷西坡白水头构造段下部油气成藏期次研究[J].石油学报,2003,19(2):359-365.
[18]王建宝,郭汝泰,肖贤明.塔里木盆地轮南低隆起早古生代油气藏形成的期次与时间研究[J].沉积学报,2002,20(2):320-332.
[19]刘建明.沉积盆地动力学与盆地流体成矿[J].矿物岩石地球化学通报,2000,19(2):76-84.
[20]张俊武,邹华耀,李平平,等.含烃盐水包裹体PVT模拟新方法及其在气藏古压力恢复中的应用[J].石油实验地质,2015,37(1):102-108.
[21]高键,何生,何治亮,等.中扬子京山地区方解石脉成因及其对油气保存的指示意义[J].石油与天然气地质,2014,35(1):33-41.
[22]杨兴业,何生,何治亮,等.京山地区方解石脉包裹体、同位素特征及古流体指示意义[J].中国石油大学学报,2013,37(1):19-34.