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| 基金项目：大型油气田及煤层气开发国家科技重大专项（2016ZX05050,2017ZX05001-002） |
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| 摘要： |
| 利用铸体薄片、压汞曲线和测井等资料，对鄂尔多斯盆地盐池和姬塬地区长61油层组的储层孔隙类型、孔隙结构及物性特征进行对比分析，并对2个地区的储层特征差异性原因进行探讨。研究表明，盐池和姬塬地区储层主要为岩屑长石砂岩、长石岩屑砂岩，储集空间以粒间孔和长石溶孔为主，孔隙结构较差。盐池地区储层物性整体低于姬塬地区，前者孔隙度和渗透率分别为7.8%和0.22×10-3μm2，后者为10.9%和0.56×10-3μm2，面孔率分别为2.10%和2.97%，属于典型的低孔、低渗储层。两者储层特征差异主要受3个方面的因素影响：沉积作用决定了储层分布范围； 局部高渗带砂体受成岩作用控制；构造作用对后期储层变化有一定的改造作用，盐池地区埋深较大，不利于原生孔隙保存。因此，在今后的石油勘探开发中，三角洲水下分流河道的绿泥石膜胶结带、次生溶孔发育区是姬塬地区勘探的有利目标；而局部构造高点、裂缝相对发育区、地层水低矿化度区是盐池地区寻找“甜点区”的另一方向。 |
| 关键词：储层特征 成岩作用 长61亚段 盐池地区 姬塬地区 鄂尔多斯盆地 |
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| Abstract: |
| Based on the analysis of casting sections, intrusive mercury curve and logging data, this work studied the pore types, pore structures and physical properties and discussed the differences of reservoir characteristics in Chang 61 reservoir in the Yanchi area and Jiyuan area, Ordos Basin. The result shows that this reservoir is dominated by lithic feldspathic sandstone and feldspathic lithic sandstone, and the main pore types are intergranular pores and feldspar dissolved pores with a poor pore structure. The physical property of the reservoir in the Yanchi area is worse than that in the Jiyuan area; the porosity and permeability of the former are 7.8% and 0.22×10-3μm2, respectively, while those of the latter are 10.9% and 0.56×10-3μm2, respectively, with areal porosity of 2.10% and 2.97%, respectively, which fall into typical low porosity and low permeability reservoir. The differences of reservoir characteristics in these areas are influenced by three factors: the distribution of reservoir is determined by the sedimentation; regional high-permeability sand bodies are controlled by diagenesis; tectonism plays a certain role on the reservoir in later period, and the large burial depth in the Yanchi area is not favorable for the preservation of primary pores. Therefore, the future major prospecting should focus on the zones of chlorite cementation in underwater distributary channel of delta and secondary pore zones in the Jiyuan area, and regard regional tectonic highs with well-developed cracks and low formation water salinity in Yanchi area as sweet spots. |
| Keywords:reservoir characteristics diagenesis Chang 61 sub-member Yanchi area Jiyuan area Ordos Basin |
| 邵晓州，付勋勋，刘广林，等.鄂尔多斯盆地盐池与姬塬地区长61储层特征差异性研究[J].地质学刊,2018,42(4):568-574 |
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