柴西咸水泉地区下油砂山组湖相沉积特征——以咸东1井取心段为例  

Lacustrine Sedimentary Characteristics of the Pliocene Xiayoushashan Formation in Xianshuiquan Area,Western Qaidam Basin:A case study from cored interval of well Xiandong 1

作　　者：陈琰 夏晓敏 李雅楠 赵健 崔俊 乔柏瀚 赵东升 高红灿 王义 谭莉 杜宗飞 王远飞 CHEN Yan;XIA XiaoMin;LI YaNan;ZHAO Jian;CUI Jun;QIAO BaiHan;ZHAO DongSheng;GAO HongCan;WANG Yi;TAN Li;DU ZongFei;WANG YuanFei(Exploration and Development Research Institute,Qinghai Oilfield Company,PetroChina,Dunhuang,Gansu 736202,China;School of Petroleum Engineering,Chongqing University of Science&Technology,Chongqing 401331,China;The Third Geological Exploration Institute of Henan Geology and Mineral Exploration and Development Bureau,Zhengzhou 450000,China)

机构地区：[1]中国石油青海油田分公司勘探开发研究院,甘肃敦煌736202 [2]重庆科技大学石油与天然气工程学院,重庆401331 [3]河南省地质矿产勘查开发局第三地质勘查院,郑州450000

出　　处：《沉积学报》2024年第2期619-631,共13页Acta Sedimentologica Sinica

基　　金：重庆市科委前沿与应用基础研究(一般)项目(cstc2014jcyjA90022);重庆科技大学研究生科技创新计划项目(YKJCX2020103)。

摘　　要：【目的】勘探实践表明,柴达木盆地剩余油主要集中于西部地区,但受复杂地表及低渗储层的影响,勘探程度相对较低。为提高柴西咸水泉地区地质认识,可进一步加快油气勘探。【方法】基于岩心沉积构造,结合岩石薄片、X衍射全岩分析化验和地震反射等资料,对咸东1井上新统下油砂山组取心段的沉积相进行综合研究。【结果与结论】(1)深灰—灰黑色灰质泥页岩中夹有灰色薄—中层块状层理细杂砂岩,砂体顶、底部与泥岩突变接触,底界面为明显凸凹不平的侵蚀面,侵蚀面之下的泥页岩中变形层理发育,砂体为沉积物再搬运的砂质碎屑流沉积;(2)深灰—灰黑色灰质泥页岩中夹有含介壳—陆源碎屑的砾屑灰岩和具明显变形层理的粉砂岩及粉砂质团块,其变形纹层清晰且具明显的变形方向,为滑塌碎屑沉积;(3)深灰—灰黑色灰质泥页岩主要夹有薄层灰色含云灰黏土质粉砂岩,泥页岩中发育水平层理及韵律层理等,粉砂岩中发育较多泥质纹层的小型单斜层理、上攀波痕纹理及厚互层层理,为半深—深湖沉积夹由沉积物重力流末期演变的较弱底流沉积。此外,盆地发育的不同时期在阿尔金山前较深水区可能具备发育类似咸东1井滑塌—沉积物重力流沉积储层的条件,尚需进一步研究。[Objective]Exploration practice of the Qaidam Basin show that the remaining petroleum in the Qaidam Basin is mainly concentrated in the western area,where relatively little exploration has been carried out due to the complex landform and the presence of typically low-permeability unconventional reservoirs.Accordingly,to increase petroleum exploration in the western Qaidam Basin.[Methods]A comprehensive study of the data from sedimentary structure observation,rock slices,X-ray diffraction whole-rock analyses and seismic data,among other techniques,was carried out on an interval of core from the Pliocene Xiayoushashan Formation in well Xiandong 1.[Results and Conclusions]The rock was found to comprise gray-black mudstone and shale interbedded with thin-to-medium massive fine-grained greywacke.The top and bottom of the sand bodies are in abrupt contact with the mudstone.The lower boundary of the sand bodies is obviously an uneven erosional surface,and the mudstone and shale beneath the erosion surface exhibits deformed bedding.The sand bodies are sandy debris flow deposits formed by re-transport.The dark-gray to gray black calcareous mudstone and shale contains interbeds of calcirudite bearing shell-terrigenous debris and siltstone,and a silty mass with obviously deformed bedding.These laminae are clearly seen and have an obvious deformation direction caused by clastic slump.The Pliocene Xiayoushashan Formation in well Xiandong 1 is mainly the dark gray-gray black mudstone and shale interbedded with siltstone bearing dolomite,calcite and clay.The mudstone and shale contains horizontal rhythmic bedding.The siltstone has developed slightly dipping cross-beds with more clay laminae,climbing-ripple lamination and coarsely interlayered bedding,which are mainly from semideep lake deposits interbedded with weaker bottom flow deposits derived from sediment gravity flows.In addition,the deeper-water areas of the Altun Mountain front appears to have developed slump-sediment gravity flow sedimentary reservoirs similar to well

关 键 词：柴达木盆地 咸水泉地区 上新统 下油砂山组 岩心 沉积相 

分 类 号：P618.13[天文地球—矿床学]