Sedimentary characters and geological implication of turbidite of the Chang 6 and Chang 7 intervals of Upper Triassic Yanchang Formation in Huangling area，Ordos Basin
Feng Juanping1, Li Wenhou2, Ouyang Zhengjian3,4
1 College of Geology and Environment，Xi′an University of Science and Technology，Xi′an 710054，Shaanxi 2 Department of Geology，Northwest University，Xi′an 710069，Shaanxi 3 Institute of Sedimentary Geology，Chengdu University of Technology，Chengdu 610059，Sichuan 4 Research Institute of Exploration and Development， PetroChina Changqing Oilfield Company，Xi′an 710018，Shaanxi
Abstract：Based on cores，thin sections，grain size analyses，the sedimentary characteristics of turbidite and its geological significance of the Chang 7 and Chang 6 intervals of Upper Triassic Yanchang Formation have been studied systematically in Huangling area of the Ordos Basin.The study results indicated that the turbidites are angular and sub-angular arkose and has the typical characteristics of turbidite deposition according to the results of grain size analysis.The turbidites are characterized by erosion surfaces，synsedimentary deformation structures，graded sequence and the Bouma sequences including ABC、AB、ADE、AE、CDE and A overlaying models which are the typical sedimentary characteristics of turbidite.The turbidite intervals mainly include two types，one is thin bedded and the other is medium-thick bedded.The tubidites are formed by the slump sediments of delta-front and can be divided into two sedimentary facies belts， i.e. the central and marginal microfacies.Turbidity sandstone is regarded as good reservoir formed in semi-deep lacustrine to deep lacustrine environments and becomes important oil-gas exploration target.
Feng Juanping,Li Wenhou,Ouyang Zhengjian. Sedimentary characters and geological implication of turbidite of the Chang 6 and Chang 7 intervals of Upper Triassic Yanchang Formation in Huangling area，Ordos Basin[J]. JOPC, 2012, 14(3): 295-302.
陈全红，李文厚，高永祥，等.2007.鄂尔多斯盆地上三叠统延长组深湖沉积与油气聚集意义［J］.中国科学（D），37（增Ⅰ）：39-48. 陈全红，李文厚，郭艳琴，等.2006.鄂尔多斯盆地南部延长组浊积岩体系及油气勘探意义［J］.地质学报，80（5）:656-663. 冯增昭，王英华，刘焕杰，等.1994.中国沉积学［M］.北京：石油工业出版社，396-426. 付金华，郭正权，邓秀芹.2005.鄂尔多斯盆地西南地区上三叠统延长组沉积相及石油地质意义［J］.古地理学报，7（1）:34-44. 傅强，吕苗苗，刘永斗.2008.鄂尔多斯盆地晚三叠世湖盆浊积岩发育特征及地质意义［J］.沉积学报，26（2）:186-192. 何自新.2003.鄂尔多斯盆地演化与油气［M］.北京：石油工业出版社，168. 李文厚，邵磊，魏红红，等.2001.西北地区湖相浊流沉积［J］.西北大学学报（自然科学版），31（1）:57-62. 刘宪斌，万晓樵，林金逞，等.2003.陆相浊流沉积体系与油气［J］.地球学报，24（1）:61-66. 刘招君.2003.湖泊水下扇沉积特征及影响因素——以伊通盆地莫里青断陷双阳组为例［J］.沉积学报，21(1):148-154. 武富礼，李文厚，李玉宏，等.2004.鄂尔多斯盆地上三叠统延长组三角洲沉积及演化［J］.古地理学报，6（3）:307-315. 夏青松，田景春.2007.鄂尔多斯盆地西南部上三叠统长6油层组湖底扇特征［J］.古地理学报，9（1）:33-43. 鄢继华，陈世悦，姜在兴.2008.三角洲前缘浊积体成因及分布规律研究［J］.石油实验地质，30（1）:16-25. 杨友运.2005.鄂尔多斯盆地南部延长组沉积体系和层序特征［J］.地质通报，24（4）:369-372. 赵俊兴，李凤杰，申晓莉，等.2008.鄂尔多斯盆地南部长6和长7油层浊流事件的沉积特征及发育模式［J］.石油学报，29（3）:389-394. 赵文智，胡素云，汪泽成，等.2003.鄂尔多斯盆地基底断裂在上三叠统延长组石油聚集中的控制作用［J］.石油勘探与开发，30（5）:1-5. 朱筱敏，杨俊生，张喜林.2004.岩相古地理研究与油气勘探［J］.古地理学报，6（1）:101-109. Bouma A H.1962.Sedimentology of Some Flysch Deposits［M］.Amsterdam：Elsevier Publishing，168. Currie B S.1997.Sequence stratigraphy of nonmarine Jurassic Cretaceous rocks，central Cordilleran foreland basin system［J］.Geological Society of America Bulletin，109(6):1206-1222. Khafizov S F，Syngaevsky P E.2005.Turbidite，slump and debris flow deposits at the Kalchinskoe and Zimnee Oilfields in West Siberian Basin［J］.Journal of Petroleum Geology，28(1):49-65. Kuenen Ph H，Migliorini C I.1950.Turbidity currents as a cause of graded bedding［J］.Geology，58:41-127. Menard H W.1955.Deep-sea channels，topography，and sedimentation［J］.AAPG Bulletin，39:236-255. Middleton G V，Hampton M A.1986.沉积物重力流：流动机制和沉积作用［R］.见：中国石油学会石油地质委员会译.国外浊积岩和扇三角洲研究.北京：石油工业出版社，20-38. Sadler P M，Osleger D A，Montanez I P.1993.On the labeling，length and objective basis of Fischer plots［J］.Journal of Sedimentary Petrology，63(3):360-368. Walker R G.1978.Deep-water sandstone facies and ancient submarine fans：Models for exploration for stratigraphic traps［J］.American Association of Petroleum Geologists Bulletin，62（6）:932-966.
