| 摘要: |
| 根据野外剖面、钻井岩芯和测井等资料,系统地对塔巴庙地区下石盒子组盒3段储集砂体的岩石学特征、孔隙类型、成岩作用以及物性进行了详细的分析。研究表明,储集层的成分和结构成熟度低;主要孔隙类型有粒间孔、粒内溶孔、晶间溶孔、铸模孔和粒缘缝;孔隙度为0.7%~18.69%,平均值为7.82%;渗透率为0.008×10-3 μm2~23.01×10-3 μm2,平均值为1.111×10-3 μm2,属于物性中-偏低的微孔-溶孔型组合型储集岩。影响储集层的主控因素包括:(1)河道控制了优质储层的分布范围和规模;(2)成岩期早期环边绿泥石胶结、溶蚀等建设性成岩作用是形成储层的基础;(3)成岩相扩大了储层的分布范围,改善了储层的物性。在上述研究的基础上,结合储集砂体的沉积微相特征、物性平面展布特征、储集砂体成岩相特征,在研究区内圈定了Ⅱ、Ⅲ两类有利勘探区块,为研究区下一步的勘探、开发提供了科学依据。 |
| 关键词: 塔巴庙 盒3段 储层特征 控制因素 有利区块 |
| DOI： |
| 附件 |
| 投稿时间：2013-09-16修订日期：2013-09-20 |
| 基金项目: |
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| Reservoir characteristics and prediction of favourable blocks in the third member of the Lower Shihezi Formation in the Tabamiao region, northern Ordos Basin |
| YANG Wei, TIAN Jing-chun, ZHANG Xiang, WANG Wen-zhi |
(1. Research Institute of Geological Engineering Exploration and Design, Sichuan Bureau of Coalfield Geology, Chengdu 610072, Sichuan, China;
2. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, Sichuan, China;
3. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China) |
| Abstract: |
| The present paper gives a detailed description of lithology, porosity types and diagenesis on the basis of cores, thin sections and well logs of the reservoir sandstones from the third member of the Lower Shihezi Formation in the Tabamiao region, northern Ordos Basin. These reservoir sandstones have lower compositional and textural maturity. The porosity types include intergranular pores, intragranular solution openings, intercrystal solution openings, moldic pores and grain-margin fissures. The porosity between 0.7% and 18.69% with an average of 7.82% and the permeability from 0.008×10-3 μm2 to 23.01×10-3 μm2 with an average of 1.111×10-3 μm2 indicate the micropores-type and solution openings-type reservoir rocks. The channels may exercise a major control on the distribution and range of the excellent reservoir rocks. The constructive diagenetic processes such as rimmed chlorite cementation and dissolution during the early diagenesis are considered as the basic conditions for the generation of reservoir rocks. The diagenetic facies play an indispensable role in the further expansion of the reservoir area and improvement of the reservoir quality of reservoir rocks. The favourable blocks are delineated in terms of sedimentary microfacies of the reservoir sandstones, planar distribution of the physical properties and diagenetic facies of the reservoir sandstones. The results of research in this study may provide a geological basis for the further exploration in the study area. |
| Key words: Tabamiao third member of the Lower Shihezi Formation reservoir characteristics controlling factor favourable block |
