准噶尔盆地石南地区清水河组沉积层序演化分析  

Sedimentary sequence evolution analysis of Qingshuihe formation in Shinan area of Junggar basin

作　　者：高崇龙 纪友亮[1,2] 任影[1,2] 蒋宜勤 周勇[1,2] 刘大卫[1,2] 段小兵[1,2] GAO Chonglong JI Youliang REN Ying JIANG Yiqin ZHOU Yong LIU Dawe DUAN Xiaobing(College of Geosciences, China University of Petroleum （Beijing）, Beijing 102249, China State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum （Beijing）, Beijing 102249, China PetroChina Xinjiang Oilfield Company, Research Institute of Experiment and Detection, Karamay, Xinjiang 834000, China)

机构地区：[1]中国石油大学(北京)地球科学学院,北京102249 [2]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [3]中国石油新疆油田分公司实验检测研究院,新疆克拉玛依834000

出　　处：《中国矿业大学学报》2016年第5期958-971,共14页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(41272157);中国石油科技创新基金项目(2014D-5006-0101)

摘　　要：为了揭示准噶尔盆地石南地区清水河组沉积层序演化及油气藏分布规律,利用岩心、分析化验、古生物、钻测井及三维地震资料,重新厘定清水河组底界及层序地层结构.在此基础上,恢复沉积期古地貌,分析清水河组物源及沉积层序演化,探讨发育油气藏类型及其特征.研究结果表明：清水河组底界应以侏罗系风化杂色泥岩上部砂砾岩或砂岩底部为标志.清水河组为一完整的三级层序,并受控于北部盆外物源体系,其中清一段底部连片砂砾岩为低位沟谷辫状河沉积,湖侵早期发育辫状河三角洲砂岩沉积,而晚期滨浅湖-半深湖相泥岩覆盖全区,清二段则为高位域沉积.石南地区清水河组沉积期沟谷-残丘古地貌特征明显,残丘主体部位最高处距沟谷内最低处高差在110～120m之间,其中低位沟谷辫状河砂砾岩体沉积厚度最大可达60m.受控于沟谷残丘这一特殊的古地貌,石南地区共发育侏罗系古残丘型、清水河组低位超覆砂砾岩型、低位沟谷砂砾岩型及湖侵砂岩型4类油气藏,而这4类油气藏是下步油气勘探的有利目标.In order to reveal the sedimentary sequence evolution characteristics and hydrocarbon reservoir distribution of Qingshuihe formation in Shinan area of Junggar basin, the bottom margin and sequence stratigraphic framework of Qingshuihe formation were redefined by core, laboratory assay data, ancient fossils, well-logging and 3-D seismic data analysis. On this basis, paleogeomorphology during the depositional stage was reconstructed; the provenance and sedimentary sequence evolution processes were analyzed; reservoir types and their characteristics were also discussed. Research results show that the bottom margin of Qingshuihe formation should be marked by sandstone above Jurassic variegated mudstone or the bottom of sandy conglomerate. Qingshuihe formation is a whole third order sedimentary sequence controlled by north extrabasinal provenance system. The bottom continuous sandy conglomerate of Q1 for- mation is lowstand braided river deposition within gullies. Braided river delta sandstone deposi- ted during the early period of transgression, while shore-shallow and hemi-deep lake mudstone covered the whole region in the late transgression period. In comparison, the Q2 formation is highstand system tract. The deposition process of Qingshuihe formation demonstrates a typical gully-monadnock paleogeomorphology with a 110-120 m height difference between highest part on monadnock and lowest part in the gully. And the maximum thickness of lowstand gulley braided river sandy conglomerate can reach 60 m. Controlled by gully-monadnock paleogeomorphology, 4 types of hydrocarbon reservoirs can be identified as favorable exploration targets, which include Jurassic monadnock reservoir, lowstand gully sandy conglomerate reservoir, lowstand overlap sandy conglomerate reservoir and transgressive sandstone reservoir.

关 键 词：准噶尔盆地 石南地区 清水河组 沉积层序 油藏类型 

分 类 号：TE122[石油与天然气工程—油气勘探]