鄂尔多斯盆地东南部马家沟组上组合沉积微相特征及展布规律
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摘要
探讨鄂尔多斯盆地东南部地区奥陶系马家沟组上组合沉积微相类型、特征以及展布规律。通过对典型钻井岩心和野外剖面进行岩石类型、结构构造的研究,对研究区的沉积微相进行识别,研究其发育特征,再现其时空分布规律。结合各单井相分析,系统编制各层系的岩相古地理图件;在相分析和古地理研究基础上,开展岩相古地理演化过程分析,揭示沉积古地理演化规律。结果表明马家沟组上组合主要发育泥云坪微相、灰云坪微相、膏云坪微相和含膏云坪微相。从马五_4沉积期到马五_1沉积期相对海平面逐渐降低,而海平面的降低控制了沉积微相的发育和空间展布。
The study of lithology, texture and structure of the drilling cores and field sections of the Upper Ordovician Majiagou Formation in southeastern Ordos Basin is carried out in order to identify the sedimentary microfacies, unravel the development characteristics and reproduce the spatial and temporal distribution law. Each single well facies is analyzed and the lithofacies paleogeographic maps of each stratum are systematically compiled. Based on the microfacies and paleogeographic research, the lithofacies paleogeographic evolution process is analyzed and the sedimentary paleogeographic evolution law is unraveled. It shows that the Majiagou Formation in the study area is mainly composed of pelitic dolomite flat, gypsum-bearing dolomite flat, gypsum dolomite flat and gypseous dolostone flat. From the deposition period of M5_4 to the deposition period of M5_1, the relative sea level is gradually lowing, while the decrease of sea level controls the development and spatial distribution of sedimentary microfacies.
The study of lithology, texture and structure of the drilling cores and field sections of the Upper Ordovician Majiagou Formation in southeastern Ordos Basin is carried out in order to identify the sedimentary microfacies, unravel the development characteristics and reproduce the spatial and temporal distribution law. Each single well facies is analyzed and the lithofacies paleogeographic maps of each stratum are systematically compiled. Based on the microfacies and paleogeographic research, the lithofacies paleogeographic evolution process is analyzed and the sedimentary paleogeographic evolution law is unraveled. It shows that the Majiagou Formation in the study area is mainly composed of pelitic dolomite flat, gypsum-bearing dolomite flat, gypsum dolomite flat and gypseous dolostone flat. From the deposition period of M5_4 to the deposition period of M5_1, the relative sea level is gradually lowing, while the decrease of sea level controls the development and spatial distribution of sedimentary microfacies.
引文
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[3] 任军峰,杨文敬,丁雪峰,等.鄂尔多斯盆地马家沟组白云岩储层特征及成因机理[J].成都理工大学学报(自然科学版),2016,43(3):274-281.Ren J F,Yang W J,Ding X F,et al.Discussion on characteristics and origin of Majiagou Formation dolomite reservoir in Ordos Basin,China [J].Journal of Chengdu University of Technology (Science & Technology Edition),2016,43(3):274-281.(in Chinese)
[4] 高星,张道锋,史云鹤,等.鄂尔多斯盆地奥陶系马五5亚段白云石结构特征及成因[J].成都理工大学学报(自然科学版),2018,45(5):575-584..Gao X,Zhang D F,Shi Y H,et al.Study of texture and genesis of Ma55 Member dolomites from Ordovician Majiagou Formation in Ordos Basin,China[J].Journal of Chengdu University of Technology (Science & Technology Edition),2018,45(5):575-584.(in Chinese)
[5] 于洲,丁振纯,吴东旭,等.鄂尔多斯盆地中东部奥陶系马家沟组沉积相演化模式研究[J].海相油气地质,2017,22(3):12-22.Yu Z,Ding Z C,Wu D X,et al.Sedimentary facies evolution model of Ordovician Majiagou Formation,Central-Eastern Ordos Basin [J].Marine Origin Petroleum Geology,2017,22(3):12-22.(in Chinese)
[6] 黄正良,陈调胜,任军峰,等.鄂尔多斯盆地奥陶系中组合白云岩储层及圈闭成藏特征[J].石油学报,2012,33(2):118-124.Huang Z L,Chen D S,Ren J F,et al.The characteristics of dolomite reservoir and trap accumulation in the middle assemblages of Ordovician in Ordos Basin,China[J].Acta Petrolei Sinica,2012,33(2):118-124.(in Chinese)
[7] 席胜利,李振宏,王欣,等.鄂尔多斯盆地奥陶系储层展布及勘探潜力[J].石油与天然气地质,2006,27(3):405-412.Xi S L,Li Z H,Wang X,et al.Distribution and exploration potential of Ordovician reservoir in Ordos Basin[J].Oil & Gas Geology,2006,27(3):405-412.(in Chinese)
[8] 成杰,张恒屹.鄂尔多斯盆地南部中奥陶世马家沟期岩相古地理[J].辽宁化工,2016,45(2):206-207.Cheng J,Zhang H Y.Lithofacies palaeogeography in Majiagou Stage of the Middle Ordovician in south Ordos area [J].Liaoning Chemical Industry,2016,45(2):206-207.(in Chinese)
[9] 魏新善,陈洪德,张道锋,等.致密碳酸盐岩储集层特征与天然气勘探潜力——以鄂尔多斯盆地伊陕斜坡东部奥陶系马家沟组为例[J].石油勘探与开发,2017,44(3):319-329.Wei X S,Chen H D,Zhang D F,et al.Gas exploration potential of tight carbonate reservoirs:A case study of Ordovician Majiagou Formation in the eastern Yi-Shan slope,Ordos Basin,NW China[J].Petroleum Exploration and Development,2017,44(3):319-329.(in Chinese)
[10] 赵俊兴,李婕,卢涛,等.苏里格地区马五段储层控制因素与成藏规律[J].成都理工大学学报(自然科学版),2012,39(4):388-394.Zhao J X,Li J,Lu T,et al.Reservoir controlling factors and accumulation regularity of Member 5 of Majiagou Formation in Sulige region of Ordos Basin,China [J].Journal of Chengdu University of Technology (Science & Technology Edition),2012,39(4):388-394.(in Chinese)
[11] 包洪平,张云峰,王前平,等.鄂尔多斯盆地马五5亚段沉积微相分布及演化[J].煤田地质与勘探,2016,44(5):16-21.Bao H P,Zhang Y F,Wang Q P,et al.Distribution and evolution of sedimentary microfacies of submember 5 Majiagou Formation in the Ordos Basin[J].Coal Geology & Exploration,2016,44(5):16-21.(in Chinese)
[12] 席胜利,熊鹰,刘显阳,等.鄂尔多斯盆地中部奥陶系马五盐下沉积环境与海平面变化[J].古地理学报,2017,19(5):773-790.Xi S L,Xiong Y,Liu X Y,et al.Sedimentary environment and sea level change of the subsalt interval of Member 5 of Ordovician Majiagou Formation in central Ordos Basin [J].Journal of Palaeogeography,2017,19(5):773-790.(in Chinese)
[13] 袁路朋,周洪瑞,景秀春,等.鄂尔多斯盆地南缘奥陶系碳酸盐微相及其沉积环境分析[J].地质学报,2014,88(3):421-432.Yuan L P,Zhou H R,Jing X C,et al.Microfacies and facies analysis of the Ordovician carbonates in the south margin of the Ordos Basin [J].Acta Geologica Sinica,2014,88(3):421-432.(in Chinese)
[14] 包洪平,杨帆,白海峰,等.细分小层岩相古地理编图的沉积学研究及油气勘探意义——以鄂尔多斯地区中东部奥陶系马家沟组马五段为例[J].岩石学报,2017,33(4):1094-1106.Bao H P,Yang F,Bai H F,et al.Sedimentology study on sub-member lithofacies paleogeography mapping and its petroleum exploration significance:Taking Ma 5 member of Lower Ordovician Majiagou Formation in central-eastern Ordos Basin for example [J].Acta Petrologica Sinica,2017,33(4):1094-1106.(in Chinese)
[15] 杨峰.滨里海盆地X区块碳酸盐岩层序地层学研究[D].大庆:东北石油大学档案馆,2016.Yang F.A Study on Carbonate Sequence Stratigraphy in Block X of Pre-Caspian Basin[D].Daqing:The Archive of Northeast Petroleum University,2016.(in Chinese)
[16] 田亚,杜治利,刘宝宪,等.鄂尔多斯盆地东南部宜川—黄龙地区奥陶系风化壳储层发育特征[J].吉林大学学报(地球科学版),2017,47(6):1620-1630.Tian Y,Du Z L,Liu B X,et al.Characteristics of Ordovician weathering crust reservoir in Yichuan-Huanglong area,southeastern Ordos Basin [J].Journal of Jilin University (Earth Science Edition),2017,47(6):1620-1630.(in Chinese)