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鄂尔多斯盆地姬塬地区延长组长91段储层差异性特征及成因
时保宏1,2,李荣堃1,田雯3,4,井向辉5,蔡郑红5
(1.西安石油大学地球科学与工程学院,陕西西安 710065;2.陕西省油气成藏地质学重点实验室,陕西西安 710065;3.胜利石油管理局博士后科研工作站,山东东营 257000;4.中国石油化工股份有限公司胜利油田分公司勘探开发研究院,山东东营 257015;5.中国石油长庆油田分公司勘探开发研究院,陕西西安 710018)
摘要:
根据大量钻井资料、岩心观察及分析化验等测试资料,采用对比分析方法对鄂尔多斯盆地姬塬地区长91段储层差异性特征及成因进行分析。结果表明:姬塬地区东、西部长91储层在粒度、分选、孔喉结构等方面存在差异,沉积及成岩的双重叠加效应造成了储层的这种差异性;研究区东部长91段沉积期处于曲流河沉积环境,发育曲流河三角洲前缘水下分流河道及河口坝两种类型砂体;砂体具有单层厚度小、纵向连续性差、结构成熟度中—低等特征,油层段较薄,主要分布在储层物性较好段;而西部长91储层以近源快速沉积的辫状河三角洲前缘水下分流河道砂为主;砂体厚度大、孔喉连通性较好,储层表现出较好的物性特征,渗透能力尤甚,形成的油层厚度大;成岩演化过程中,砂岩粒度相对较粗、孔喉结构较好的西部储层因压实作用损失的孔隙度低于东部,但压实后东、西部储层均未变致密。胶结物对储层物性影响差异较大,早期胶结作用对西部储层孔隙度的影响甚微,晚期胶结作用对西部储层的影响较大,晚期胶结作用后储层变得致密;早期胶结作用对东部储层孔隙度的影响则较大,早期胶结作用后储层变得较致密。
关键词:  砂体成因  储层特征  姬塬地区  鄂尔多斯盆地
DOI:10.3969/j.issn.1673-5005.2019.04.001
分类号::TE 122.2
文献标识码:A
基金项目:国家科技重大专项(2017ZX05039-001);胜利油田博士后项目(YKB1701)
Differences of characteristics and genetic of reservoirs in Chang 91 of Yanchang Formation in Jiyuan area, Ordons Basin
SHI Baohong1,2, LI Rongkun1, TIAN Wen3,4, JING Xianghui5, CAI Zhenghong5
(1.School of Earth Science and Engineering, Xi 'an Shiyou University, Xi 'an 710065, China;2.Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi 'an 710065, China;3.Postdoctoral Scientific Research Workstation of Shengli Petroleum Administration, Dongying 257000, China;4.Institute of Exploration and Development, Shengli Oil and Gas Branch Company, SINOPEC, Dongying 257015, China;5.Institute of Exploration and Development, Changqing Oil and Gas Branch Company, PetroChina, Xi 'an 710018, China)
Abstract:
Based on a large number of well data and core observations, the reservoir difference characteristics and genesis of Chang 91 in the Jiyuan area of Ordos Basin were analyzed using comparative analysis. The results show that the sand bodies of Chang 91 in the east of the study area have the characteristics of small thickness of single layer, poor longitudinal continuity, and medium-low structural maturity.The sand bodies of Chang 91 in the west of the study area are thick, good pore throat connectivity, with good physical characteristics, especially the permeability, and the oil layers are thicker than the eastern ones. The dual superposition effects of sedimentation and diagenesis result in the different reservoir characteristics between the east and the west. In the east, there are mainly two types of sand bodies, namely, underwater distributary channel and estuarine bar at the leading edge of meandering river delta, while braided river delta leading edge underwater distributary channel sands deposited are the main sands in the west. During the diagenetic evolution, the reduced porosity of the reservoir in the west with relatively coarse grain size sandstone and better pore throat structure was lower than that in the east due to compaction. The cementation has a great influence on reservoir physical properties. Early cementation has little influence on reservoir porosity in west, late cementation has a great influence on reservoirs in west, and the reservoirs became dense after late cementation. However, the early cementation has a great influence on the porosity of the eastern reservoir, and the reservoir becomes denser eventually after the early cementation.
Key words:  genesis of sand body  reservoir characteristics  Jiyuan area  Ordos Basin
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