鄂尔多斯盆地姬塬地区长4+5油藏控制因素及成藏模式

摘要/Abstract

摘要： 鄂尔多斯盆地姬塬地区长4+5 储层致密，在油藏大面积发育的同时，层间和层内含油性差异较大，油水关系复杂，油水分布影响因素待进一步明确。成藏控制因素分析表明，长7 广布式的烃源岩提供了丰富的资源基础，差异成岩作用控制下的三角洲前缘相对高孔高渗储层是油气聚集的场所，大量发育的裂缝是石油运移的重要通道，三者整体控制长4+5 油藏大面积、大规模发育，但在局部受烃源岩厚度、裂缝发育程度和储层非均质性的影响，石油富集程度存在差异。创新提出 “长7 油源、裂缝及渗透性砂岩通道、非等动力垂向多点充注、物性控制非均匀成藏”模式，有效揭示了长4+5 油藏大范围发育但差异性含油的地质成因。

关键词: 烃源岩, 储层物性, 充注动力, 成藏控制因素, 长4+5 油层组, 鄂尔多斯盆地

Abstract: Chang 4+5 oil reservoirs in Jiyuan area, the Ordos Basin, are characterized by low permeability, complicated oil-water relationship and greatly different oil-bearing potentials in and between layers, in addition to extensive development. Moreover, factors affecting oil and water distribution in the reservoirs need to be further ascertained. The analysis on the controlling factors of hydrocarbon accumulation shows that the large-scale extensive development of Chang 4+5 oil reservoirs are controlled by three factors. First, the widespread Chang 7 source rocks provide abundant resource base. Second, high porosity and high permeability reservoirs of delta front facies controlled by differential diagenesis act as the places for oil and gas accumulation. And third, a great number of fractures are important oil migration pathways. Locally, however, affected by source rock thickness, fracture development degree and reservoir heterogeneity, oil enrichment degrees are different. In this paper, a hydrocarbon accumulation pattern was innovatively proposed with Chang 7 Member as the oil source, oil migrating along fractures and permeable sandstones pathways, non-isokinetic multi-point charging vertically, and physical properties controlling heterogeneous reservoir formation. Based on this pattern, the reasons for the extensive development and different oil-bearing potentials of Chang 4+5 oil reservoirs are revealed geologically.

Key words: source rocks, reservoir physical properties, oil charging force, controlling factors of hydrocarbon accumulation, Chang 4+5 oil reservoirs, Ordos Basin

李成, 淡卫东, 袁京素, 辛红刚, 张三, 马艳丽. 鄂尔多斯盆地姬塬地区长4+5油藏控制因素及成藏模式[J]. 中国石油勘探, 2016, 21(2): 45-52.

Li Cheng, Dan Weidong, Yuan Jingsu, Xin Honggang, Zhang San, Ma Yanli. Controlling factors and hydrocarbon accumulation pattern of Chang 4+5 oil reservoirs in Jiyuan area, Ordos Basin[J]. China Petroleum Exploration, 2016, 21(2): 45-52.

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