宣汉-达县地区飞仙关组层序地层与颗粒滩特征
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摘要
通过对岩心和野外露头剖面的精细观察,利用地震地层综合解释剖面,结合海平面变化,将川东北宣汉-达县地区飞仙关组划分为2个三级层序和8个体系域。在此基础上对飞仙关组层序地层及滩体在纵横向上发育特征以及不同体系域内的展布进行研究。结果表明:TSQ1层序发育期,颗粒滩主要发育于高位体系域时期,且以台地边缘滩为主,纵向上具有向上变粗、变厚,但单滩体厚度变化大的特点;横向上滩体分布不稳定,发育层位具有向南爬升的特点,沿台缘带呈北西—南东向展布。TSQ2层序发育期,由于填平补齐作用,PG主体演变为局限台地;颗粒滩主要发育于早期高位体系域时期,为台内点滩沉积,滩体沉积厚度较小,大致呈北东—南西向分布。
Based on the study of precise observation and description of core and outcrops, with the analysis of seismic stratigraphic comprehensive interpretation, the Feixianguan Formation in the Xuanhan-Daxian zone, northeastern Sichuan, can be divided into 2 third-order sequences, eight system tracts in terms of sedimentary facies and sequence interfaces. At the same time, the vertical and horizontal developmental characteristics and the distribution of different system tracts of the sequences and shoal were studied.Results show that, during the development of TSQ1 sequence, grain shoales, mostly platform margin shoales, mainly developed during the highstand system tracts and have the characteristics of thickening and coarsening upward, but the thickness of single shoal varies greatly; the distribution of shoales is unstable horizontally, and migrates upward toward south in developing stratum on the profile, which expands in the direction of northwest-southeast along the platform margin; during the development of TSQ2 sequence, due to the effect of filling, PG area evolved into restricted platform; grain shoals developed mainly in the early of highstand system tract, which are platform inner shoals, and these shoales were thin in thickness and expands in the direction of northeast-southwest.
Based on the study of precise observation and description of core and outcrops, with the analysis of seismic stratigraphic comprehensive interpretation, the Feixianguan Formation in the Xuanhan-Daxian zone, northeastern Sichuan, can be divided into 2 third-order sequences, eight system tracts in terms of sedimentary facies and sequence interfaces. At the same time, the vertical and horizontal developmental characteristics and the distribution of different system tracts of the sequences and shoal were studied.Results show that, during the development of TSQ1 sequence, grain shoales, mostly platform margin shoales, mainly developed during the highstand system tracts and have the characteristics of thickening and coarsening upward, but the thickness of single shoal varies greatly; the distribution of shoales is unstable horizontally, and migrates upward toward south in developing stratum on the profile, which expands in the direction of northwest-southeast along the platform margin; during the development of TSQ2 sequence, due to the effect of filling, PG area evolved into restricted platform; grain shoals developed mainly in the early of highstand system tract, which are platform inner shoals, and these shoales were thin in thickness and expands in the direction of northeast-southwest.
引文
[1]马永生,蔡勋育,赵培荣.四川盆地大中型天然气田分布特征与勘探方向[J].石油学报,2010,31(3):347-354.
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[10]许效松,刘宝,赵玉光.上扬子台地西缘二叠系—三叠系层序界面成因分析与盆山转换[J].特提斯地质,1996,16(20):6-35.
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[12]文应初,王一刚,程绪彬,等.四川地区早三叠世飞仙关期碳酸盐台地增生与有利储集相带展布[J].天然气工业,1988,8(2):18-23.
[13]唐永,梅廉夫,肖安成,等.川东北宣汉-达县地区晚中生代—新生代构造应力场转化及其油气意义[J].石油学报,2013,34(1):59-70.
[14]谭先锋,李洁,何金平,等.开江-梁平陆棚区带南段飞仙关组层序-岩相古地理特征[J].中国地质,2012,39(3):612-622.
[15]陈洪德,钟怡江,侯明才,等.川东北地区长兴组—飞仙关组碳酸盐岩台地层序充填结构及成藏效应[J].石油与天然气地质,2009,30(5):539-547.
[16]马永生,储昭宏.普光气田台地建造过程及其礁滩储层高精度层序地层学研究[J].石油与天然气地质,2008,29(5):548-556.
[17]李国军,郑荣才,唐玉林,等.川东北地区飞仙关组层序-岩相古地理特征[J].岩性油气藏,2007,19(4):64-70.
[18]徐胜林,陈洪德,陈安清,等.四川盆地泥盆系—中三叠统层序格架内生储盖分布[J].石油勘探与开发,2011,38(2):159-167.
[19]MOORE C H.Carbonateresernoirs porosity evolution and diagenesis in a sequence stratigraphic framework:developments in Sedimentology[J].Marine and Petroleum Geology,2002,55(10):1295-1296.
[20]SCHLAGER W.Scaling of sedimentation rates and drowning of reefs and carbonate platforms[J].Geology,1999,27(2):183-186.
[21]李凌,谭秀成,丁熊,等.四川盆地雷口坡组台内滩与台缘滩沉积特征差异及对储层的控制[J].石油学报,2011,32(1):70-76.
[22]谭秀成,刘晓光,陈景山,等.磨溪气田嘉二段陆表海碳酸盐岩台地内滩体发育规律[J].沉积学报,2009,27(5):995-1001.
[2]马永生,蔡勋育,赵培荣.深层、超深层碳酸盐岩油气储层形成机理研究综述[J].地学前缘,2011,18(4):181-192.
[3]马永生,牟传龙,谭钦银,等.达县-宣汉地区长兴组—飞仙关组礁滩相特征及其对储层的制约[J].地学前缘,2007,14(1):182-192.
[4]马永生,蔡勋育,李国雄.四川盆地普光大型气藏基本特征及成藏富集规律[J].地质学报,2005,79(6):858-865.
[5]王兴志,张帆,马青,等.四川盆地东部晚二叠世—早三叠世飞仙关期礁、滩特征与海平面变化[J].沉积学报,2002,20(2):249-254.
[6]李凌,谭秀成,夏吉文,等.海平面升降对威远寒武系滩相储层的影响[J].天然气工业,2008,28(4):19-21.
[7]邬光辉,李启明,张宝收,等.塔中Ⅰ号断裂坡折带构造特征及勘探领域[J].石油学报,2005,26(1):27-30.
[8]WESTPHAL H,RIEGL B,EBERLI G P,et al.Carbonate depositional systems:asses sing dimensions and controlling parameters the Bahamas Belize and the Persian/Arabian gulf[M].Beilin:Springer,2010:215-230.
[9]郑荣才,罗平,文其兵,等.川东北地区飞仙关组层序-岩相古地理特征和鲕滩预测[J].沉积学报,2009,27(1):1-8.
[10]许效松,刘宝,赵玉光.上扬子台地西缘二叠系—三叠系层序界面成因分析与盆山转换[J].特提斯地质,1996,16(20):6-35.
[11]马永生,牟传龙,郭彤楼,等.四川盆地东北部飞仙关组层序地层与储层分布[J].矿物岩石,2005,25(4):73-79.
[12]文应初,王一刚,程绪彬,等.四川地区早三叠世飞仙关期碳酸盐台地增生与有利储集相带展布[J].天然气工业,1988,8(2):18-23.
[13]唐永,梅廉夫,肖安成,等.川东北宣汉-达县地区晚中生代—新生代构造应力场转化及其油气意义[J].石油学报,2013,34(1):59-70.
[14]谭先锋,李洁,何金平,等.开江-梁平陆棚区带南段飞仙关组层序-岩相古地理特征[J].中国地质,2012,39(3):612-622.
[15]陈洪德,钟怡江,侯明才,等.川东北地区长兴组—飞仙关组碳酸盐岩台地层序充填结构及成藏效应[J].石油与天然气地质,2009,30(5):539-547.
[16]马永生,储昭宏.普光气田台地建造过程及其礁滩储层高精度层序地层学研究[J].石油与天然气地质,2008,29(5):548-556.
[17]李国军,郑荣才,唐玉林,等.川东北地区飞仙关组层序-岩相古地理特征[J].岩性油气藏,2007,19(4):64-70.
[18]徐胜林,陈洪德,陈安清,等.四川盆地泥盆系—中三叠统层序格架内生储盖分布[J].石油勘探与开发,2011,38(2):159-167.
[19]MOORE C H.Carbonateresernoirs porosity evolution and diagenesis in a sequence stratigraphic framework:developments in Sedimentology[J].Marine and Petroleum Geology,2002,55(10):1295-1296.
[20]SCHLAGER W.Scaling of sedimentation rates and drowning of reefs and carbonate platforms[J].Geology,1999,27(2):183-186.
[21]李凌,谭秀成,丁熊,等.四川盆地雷口坡组台内滩与台缘滩沉积特征差异及对储层的控制[J].石油学报,2011,32(1):70-76.
[22]谭秀成,刘晓光,陈景山,等.磨溪气田嘉二段陆表海碳酸盐岩台地内滩体发育规律[J].沉积学报,2009,27(5):995-1001.