张朋霖,刘招君,孙平昌,王君贤,王克兵
ZHANG Penglin,LIU Zhaojun,SUN Pingchang,WANG Junxian,WANG Kebing

• 1:吉林大学地球科学学院
• 2:吉林省油页岩及共生能源矿产重点实验室

摘要(Abstract)：

柴北缘团鱼山地区中侏罗统石门沟组含煤段砂体分布广、厚度大,有可能成为良好的油气储层。通过岩心观察、粒度及测井曲线分析,并利用频率曲线、概率累计曲线、C-M图分析、散点图分析等对各微相沉积粒度特征及水动力环境进行精细研究。结果表明:石门沟组主要为三角洲相沉积,进一步可划分为三角洲平原、三角洲前缘、前三角洲3种亚相和水上分流河道、水上分流河道间、水下分流河道、水下分流河道间、河口坝及席状砂6种沉积微相; C-M图表现为典型的牵引流沉积特征,席状砂、分流河道间、河口坝主要集中在QR段,搬运方式以递变悬浮为主,水下分流河道集中于QPPO段,以跳跃搬运方式为主,三角洲平原水上分流河道集中于PO-ON段,滚动组分较多,以跳跃搬运方式为主;砂岩总体向上变粗,呈逆粒序特征;席状砂、河口坝、水下分流河道微相概率累计曲线均为2段式,以跳跃组分为主,三者曲线斜率依次变小,沉积颗粒分选变差,水动力增强;水上分流河道微相水动力最强,概率累计曲线为3段式,以跳跃组分为主,存在滚动组分,曲线斜率最小,分选最差。
The sandbodies in Middle-Jurassic Shimengou-Formation coal-bearing interval in Yushan area in the northern margin of Qaidam Basin are characterized by the wide distribution and a large thickness,which may become a good oil and gas reservoir. Through the core observation,the particle size and log curve analyses and moreover with the help of the frequency curve,probability accumulation curve,C-M map analysis,scatter plot analysis,etc.,the granularity characteristics and hydrodynamic environments of each microfacies were studied in detail. The study achievements show that Shimengou-Formation is mainly the delta facies deposit,which can be further divided into three sub-phases: delta plain,delta front and front delta and moreover the six sedimentary microfacies: water distributary channel,water distributary interchannel,underwater distributary channel,underwater distributary interchannel,river mouth bar and sheet sand. C-M shows the typical traction-flow sedimentary features; the sheet sand,the distributary channel and the mouth bar are mainly concentrated in QR Interval,the graded suspension is the main transporting mode; the underwater distributary channel is concentrated in QP-PO Interval with the jump-ing transportation as the main form,the delta-plain water distributary channel is concentrated in PO-ON Interval,the rolling component is much more,but the jumping transportation is still the main form; in general,the sandstone becomes coarser upward and presents the reverse grain order; the micro-phase probability cumulative curves of the sheet sand,mouth bar and underwater distributary channel are all two-staged with the jumping component as the main form,and the slopes of the three curves become smaller,the sorting of the sedimentary particle is deteriorated and the hydrodynamic force is enhanced; the hydrodynamics of the water distributary channel micro-facies is the strongest,the probability cumulative curve can be divided into 3 segments,which is mainly composed of the jumping component,there are rolling components,the slope of the curve is the least,the sorting is the worst.

关键词(KeyWords)： 粒度分析;搬运方式;水动力条件;三角洲;含煤段;石门沟组
particle size analysis;transport mode;hydrodynamic condition;delta;coal-bearing interval;Shimengou Formation

Abstract:

Keywords:

基金项目(Foundation): 中国地质调查局油气资源调查中心战略选区项目“柴达木盆地北缘油页岩资源基础地质调查”(DD20160188-01)

作者(Author): 张朋霖,刘招君,孙平昌,王君贤,王克兵
ZHANG Penglin,LIU Zhaojun,SUN Pingchang,WANG Junxian,WANG Kebing

DOI: 10.19597/j.issn.1000-3754.201804022

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