| 鄂尔多斯盆地吴起地区延长组长4+5段储层非均质性特征 |
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| 引用本文： | 张娟,张晓辉,盖珊珊,任继胜.鄂尔多斯盆地吴起地区延长组长4+5段储层非均质性特征[J].地质与勘探,2019,55(6):1540-1548. |
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| 作者姓名： | 张娟 张晓辉 盖珊珊 任继胜 |
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| 作者单位： | 西安石油大学地球科学与工程学院,陕西西安,710000;中国石油长庆油田公司勘探开发研究院,陕西西安,710016;中国石油长庆油田公司工程监督处,陕西西安,710016;中国石油渤海钻探第二录井公司,河北任丘,062550 |
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| 基金项目： | 国家科技支撑计划项目“陕北煤化工 CO2捕集、埋存与提高采收率技术示范”（2012BAC26B00）和陕西省科技统筹创新工程计划项目“陕北致密砂岩油藏 CO2驱提高采收率关键技术研究及先导试验”（2014KTZB03-02）联合资助。 |
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| 摘 要： | 储层非均质性对剩余油分布和水驱或气驱波及系数影响较大,开展储层非均质精细评价,是油田开发方案调整和剩余油挖潜必不可少的内容。利用密井网测井资料和岩矿鉴定等资料,从沉积、成岩作用等方面对吴起油沟油田长4+5段储层非均质进行了研究。结果表明,研究区长4+5段诸层为三角洲前缘沉积末端,单期水下分流河道规模较小且改道频繁,层内泥质夹层不发育,层间隔层发育,单砂体连通性差,非均质性较强;纵向上将长4+5段分为长4+5_1、长4+5_2~1、长4+5_2~2三个小层,受沉积环境和成岩作用,特别是碳酸盐胶结作用的影响,层内非均质性多为正韵律或复合韵律,其中长4+5_1储层非均质性最强,长4+5_2~2储层非均质性最弱;从层间非均质性来看,其中长4+5_1单层砂体薄,分层系数最大,长4+5_2~2储单层砂体厚度大,分层系数较小;从平面非均质性来看,长4+5_1砂体呈交切窄条带状发育,砂体厚度横向变化大,平面非均质性较强;长4+5_2~1砂体呈孤立条带状分布,砂体欠发育,以分流涧湾为主;长4+5_2~2砂体厚度大,且呈连片发育,平面非均质性较弱。
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| 关 键 词： | 三角洲前缘 水下分流河道 储层非均质性 延长组4+5段 吴起地区 鄂尔多斯盆地 |
| 收稿时间： | 2018/7/16 0:00:00 |
| 修稿时间： | 2019/6/17 0:00:00 |
Heterogeneity of reservoirs in the member Chang 4+5 in Triassic Yanchang Formation in the Wuqi area of Ordos Basin |
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| Zhang Juan.Heterogeneity of reservoirs in the member Chang 4+5 in Triassic Yanchang Formation in the Wuqi area of Ordos Basin[J].Geology and Prospecting,2019,55(6):1540-1548. |
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| Authors: | Zhang Juan |
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| Abstract: | Reservoir heterogeneity has a great impact on remaining oil distribution and water-flooding or gas-driving sweep efficiency. So evaluating reservoir heterogeneity exquisitely is essential in adjustment of the oilfield development plan and residual oil digging. Using data of logging of a dense well network and rock-ore identification, focusing on sedimentation and diagenesis, this work studies the heterogeneity of reservoirs in member Chang 4+5 of the Yougou oil field in the Wuqi area, Ordos Basin. Results show that this section is the end of the leading edge of a delta, where the single stage underwater distributary channel is small that diversiformed frequently, with a little argillaceous sandwich and many inter-layers, poor single sand-body connectivity and strong heterogeneity. In vertical direction, it is divided into C4+51, C4+521, and C4+522 three sub-layers. Influenced by the deposition environment and diagenesis, especially the carbonate cementation, the heterogeneity is mostly positive or composite rhythm, and C4+51 has the strongest heterogeneity while C4+522 has weakest heterogeneity. In terms of the inter-layer heterogeneity, C4+51 has thin single layer sand bodies and the largest layering coefficient, C4+522 has thick single layer sand bodies and smaller layering coefficient. From the perspective of planar heterogeneity, C4+51 host many intersecting narrow strips and highly variable thicknesses of sand bodies, showing intense planar heterogeneity. Sand bodies in the sub-layer C4+521 are distributed as isolated strips, of underdevelopment, dominated by distributary channels. Sand bodies in C4+522 are relatively thicker, more continuous, exhibiting weak planar heterogeneity. |
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| Keywords: | delta front underwater distributary channel reservoir heterogeneity Chang 4+5 Wuqi area Ordos Basin |
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