琼东南盆地乐东—陵水凹陷中新统储层流体包裹体特征及成藏期研究
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摘要
通过流体包裹体的镜下观察及均一温度测定,对琼东南盆地乐东—陵水凹陷中新统储层流体包裹体特征及成藏期进行了研究。研究表明:流体包裹体主要沿石英愈合裂隙呈带状分布,部分在石英颗粒边部分布或切穿多个碎屑颗粒;主要包括盐水包裹体、液烃包裹体、气烃包裹体和气液烃包裹体四种类型,其中烃类包裹体呈三期发育,荧光下多为黄色—蓝白色,有机质成熟度较高;流体包裹体的均一温度呈不连续分布,峰值主要集中在130~150℃范围内。根据流体包裹体的特征、产状及均一温度,综合分析认为,中新统储层主要发育三期烃类流体充注和一期CO2流体充注,其中第二、第三期烃类流体充注为主要成藏期,CO2流体充注发生在天然气充注晚期。结合埋藏史与热演化史可知主要成藏期为1.9 Ma~1 Ma,对应新近纪上新世莺歌海末期—第四纪更新世乐东期。
Based on the observation of microscope and the measurement of homogenization temperature of fluid inclusions, the characteristics of fluid inclusions and the accumulation period of Miocene reservoir in Ledong-Lingshui Sag of Qiongdongnan Basin are discussed. The results indicate that the fluid inclusions are mainly distributed along the healing fissures in quartz, partly distributed in the side of quartz granules or through multiple clastic particles. The types of fluid inclusions mainly include brine inclusions, liquid hydrocarbon inclusions, gaseous hydrocarbon inclusions and gas-liquid hydrocarbon inclusions. The hydrocarbon inclusions are developed in three phases, which present yellow and blue-white fluorescence with high organic maturity. The distribution of homogenization temperatures is discontinuous and concentrates in the range of 130℃ to 150℃. According to the comprehensive analysis of characteristics and occurrence of fluid inclusions, and homogenization temperatures, it is determined that the Miocene reservoir experienced three phases of hydrocarbon filling and one phase of CO2 filling, which happened in the late stage of natural gas injection, and the second and third phase of hydrocarbon filling are the main period of hydrocarbon accumulation. Combined with the burial history and thermal evolution, it can be concluded that the main period of hydrocarbon accumulation is 1.9 Ma~1 Ma.
Based on the observation of microscope and the measurement of homogenization temperature of fluid inclusions, the characteristics of fluid inclusions and the accumulation period of Miocene reservoir in Ledong-Lingshui Sag of Qiongdongnan Basin are discussed. The results indicate that the fluid inclusions are mainly distributed along the healing fissures in quartz, partly distributed in the side of quartz granules or through multiple clastic particles. The types of fluid inclusions mainly include brine inclusions, liquid hydrocarbon inclusions, gaseous hydrocarbon inclusions and gas-liquid hydrocarbon inclusions. The hydrocarbon inclusions are developed in three phases, which present yellow and blue-white fluorescence with high organic maturity. The distribution of homogenization temperatures is discontinuous and concentrates in the range of 130℃ to 150℃. According to the comprehensive analysis of characteristics and occurrence of fluid inclusions, and homogenization temperatures, it is determined that the Miocene reservoir experienced three phases of hydrocarbon filling and one phase of CO2 filling, which happened in the late stage of natural gas injection, and the second and third phase of hydrocarbon filling are the main period of hydrocarbon accumulation. Combined with the burial history and thermal evolution, it can be concluded that the main period of hydrocarbon accumulation is 1.9 Ma~1 Ma.
引文
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[2]吕福亮,贺训云,武金云,等.世界深水油气勘探现状、发展趋势及对我国深水勘探的启示[J].中国石油勘探,2007(6):28-31.
[3]谢玉洪.南海北部自营深水天然气勘探重大突破及其启示[J].天然气工业,2014,34(10):1-8.
[4]尤丽,王振峰,钟佳,等.乐东-陵水凹陷黄流组峡谷水道储层特征及影响因素[J].天然气工业,2015,35(10):31-38.
[5]赵民,张晓宝,吉利明,等.琼东南盆地构造演化特征及其对油气藏的控制浅析[J].天然气地球科学,2010,21(3):494-502.
[6]苏明,张成,解习农,等.深水峡谷体系控制因素分析---以南海北部琼东南盆地中央峡谷体系为例[J].中国科学:地球科学,2014,44(8):1807-1820.
[7]王子嵩,刘震,孙志鹏,等.琼东南深水区乐东-陵水凹陷渐新统烃源岩早期预测及评价[J].中南大学学报:自然科学版,2014,45(3):876-888.
[8]徐新德,张迎朝,梁刚,等.南海北部琼东南盆地深水区烃源条件及天然气成藏机制[J].天然气地球科学,2016,27(11):1985-1992.
[9]黄保家,李绪深,王振峰,等.琼东南盆地深水区烃源岩地球化学特征与天然气潜力[J].中国海上油气,2012,24(4):1-7.
[10]黄艳辉,刘震,陈婕,等.利用地震信息定量预测烃源岩热成熟度---以琼东南盆地乐东-陵水凹陷为例[J].石油地球物理勘探,2013,48(6):985-994.
[11]姚哲,朱继田,左倩媚,等.琼东南盆地深水区重力流沉积体系及油气勘探前景[J].天然气工业,2015,35(10):21-30.
[12]王振峰.深水重要油气储层---琼东南盆地中央峡谷体系[J].沉积学报,2012,30(4):646-653.
[13]范彩伟,李绪深,刘昆,等.琼东南盆地乐东、陵水凹陷中新统岩性地层圈闭成藏条件[J].中国海上油气,2016,28(2):53-59.
[14]许怀智,张迎朝,林春明,等.琼东南盆地中央峡谷天然气成藏特征及其主控因素[J].地质学报,2014,88(9):1741-1752.
[15]王振峰,李绪深,孙志鹏,等.琼东南盆地深水区油气成藏条件和勘探潜力[J].中国海上油气,2011,23(1):7-13,31.
[16]杨金海,李才,李涛,等.琼东南盆地深水区中央峡谷天然气成藏条件与成藏模式[J].地质学报,2014,88(11):2141-2149.
[17]李明诚,单秀琴,马成华,等.油气成藏期探讨[J].新疆石油地质,2005,26(5):587-591.
[18]李建华,范柏江,耿辉.油气成藏期研究方法和进展[J].科技导报,2010,28(22):106-111.
[19]刘正华,陈红汉.琼东南盆地东部地区油气形成期次和时期[J].现代地质,2011,25(2):279-288.
[20]贾元琴,胡沛青,张铭杰,等.琼东南盆地崖城地区流体包裹体特征和油气充注期次分析[J].沉积学报,2012,30(1):189-196.
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[23]苏龙,郑建京,王琪,等.琼东南盆地超压研究进展及形成机制[J].天然气地球科学,2012,23(4):662-672.
[24]朱文慧,曲希玉,查明,等.南堡凹陷下古生界流体包裹体特征及成藏期研究[J].世界地质,2015,34(1):148-156.
[25]张斌,王璞珺,张功成,等.珠-琼盆地新生界火山岩特征及其油气地质意义[J].石油勘探与开发,2013,40(6):657-665.
[26]朱焕来,曲希玉,刘立,等.CO2流体-长石相互作用实验研究[J].吉林大学学报:地球科学版,2011,41(3):697-706.
[27]苏奥,杜江民,陈红汉,等.控制异常孔隙带发育的成岩流体类型与活动历史---以琼东南盆地东部宝岛北缘储层为例[J].天然气地球科学,2016,27(10):1837-1847.