陈俊飞,李琦,朱如凯,毛治国
CHEN Junfei,LI Qi,ZHU Rukai,MAO Zhiguo

• 1:中国地质大学(北京)海洋学院
• 2:中国石油勘探开发研究院

摘要(Abstract)：

粒度是沉积物的重要结构特征,通过粒度资料分析沉积物的搬运方式和水动力条件,能有效判断储层的沉积环境。以鄂尔多斯盆地西南部上三叠统延长组长8段致密储层为例,在岩心观察、岩心样品粒度分析、测井数据分析的基础上,利用砂岩粒度概率累积曲线和C—M图解相结合的研究方法,明确了研究区致密砂岩储层的粒度特征及沉积环境,并建立了辫状河三角洲前缘沉积和粒度概率累积曲线演化模式。研究结果表明:目的层主要发育中砂岩、细砂岩和粉砂岩,分选中等,磨圆中等—差,以牵引流为主;长8段沉积时期属于辫状河三角洲前缘沉积环境,以水下分流河道微相为主,河口坝和远砂坝微相次之;随着沉积物平均粒径的减小,储层孔隙度和渗透率降低,其中水下分流河道砂体是致密油最有利的储集体。研究成果为致密砂岩储层沉积环境的分析提供了理论依据,可指导研究区乃至鄂尔多斯盆地致密砂岩储层进一步勘探。
As the important feature of the sediments for the grain size,with the help of the grain size analysis,the transporting modes of the sediments and the hydrodynamic conditions can be effectively judged the sedimentary environments of the reservoir. Taking the tight reservoir in Yanchang-Formation Member Chang-8 of Upper Triassic Series in Southwest Ordos Basin as an example,based on the core observation,the grain-size analyses of the core sample and the logging data,with the help of the combined researching method of the probability cumulative curvesof the sandstone grain size with C-M illustration,the grain-size characteristics and the sedimentary environment of the tight sandstone reservoir in the study area were made clear,and moreover the modes of the braided river delta front sedimentation and the grain-size probability cumulative curve evolution were established. The study achievements show that the medium sandstone,fine sandstone and siltstone are mainly well-developed in the target layer characterized by the moderate sorting,medium-poor psephicity and mainly composed of the traction current; the sedimentary stage of Member Chang-8 occurred in the sedimentary environment of the braided river delta front,and taking the underwater distributary channel microfacies as the principal form,the next are the mouth bar and distal bar microfacieses; with the decrease of the average grain size of the sediment,so do the reservoir porosity and permeability,the sandbody in the underwater distributary channel is the most favorable reservoir of the tight oil. The research achievements have provided the theoretical basis for the analysis of the sedimentary environment of the tight sandstone reservoir and can guide the study area and moreover the further exploration of the tight sandstone reservoir in Ordos Basin.

关键词(KeyWords)： 粒度特征;致密砂岩储层;沉积环境;长8段;辫状河三角洲前缘
grain-size characteristic;tight sandstone reservoir;sedimentary environment;Member Chang-8;braided river delta front

Abstract:

Keywords:

基金项目(Foundation): 国家重点基础研究发展计划(973计划)“中国陆相致密油(页岩油)形成机理与富集规律”(2014CB239000);; 国家自然科学基金项目“冲绳海槽西部陆坡第四纪海底峡谷体系沉积演化与控制因素分析”(41576066)

作者(Author): 陈俊飞,李琦,朱如凯,毛治国
CHEN Junfei,LI Qi,ZHU Rukai,MAO Zhiguo

DOI: 10.19597/J.ISSN.1000-3754.201803073

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