| 济阳坳陷陡坡带沙河街组砂砾岩体储层质量差异性研究 |
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| 引用本文： | 朱筱敏,张守鹏,韩雪芳,陶文芳.济阳坳陷陡坡带沙河街组砂砾岩体储层质量差异性研究[J].沉积学报,2013,31(6):1094-1104. |
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| 作者姓名： | 朱筱敏 张守鹏 韩雪芳 陶文芳 |
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| 摘 要： | 济阳坳陷不同凹陷北部陡坡带沙河街组沙三段或沙四段发育近岸水下扇或三角洲较粗粒砂砾岩体，其中东营凹陷北部发育近岸水下扇（利88井区）、惠民凹陷北部发育三角洲（基山砂体）、沾化凹陷北部发育扇三角洲（义170井区）、车镇凹陷北部发育近岸水下扇（车66井区），它们的沉积类型及组成均存在差异。大量岩芯和储层实验资料分析表明，在埋藏成岩演化过程中，沙河街组储层均经历了压实、胶结、溶解和交代等成岩作用。但受沉积类型及组成、埋藏速率、古地温变化、断裂作用等基本地质因素差异的影响，不同沉积成因的凹陷北部陡坡带碎屑岩储层经历的成岩作用、成岩演化和物性发育特征具有差异性，总体形成了低孔低渗储层。目前，不同凹陷北部陡坡带沙河街组碎屑岩埋深多为2 000~3 000 m，储层处于中成岩演化阶段。尽管济阳坳陷不同凹陷陡坡带沙河街组储层和成岩演化阶段具有相似性，但是沙河街组储层质量存在差异。这种储层质量差异不仅受控于原始沉积条件，而且也受控于储层成岩演化。在埋深和成岩演化阶段相同的情况下，溶蚀作用对于改善储层质量起到了重要作用。济阳坳陷四个凹陷北部砂砾岩体储层主要经受了有机酸对碳酸盐胶结物和长石以及岩屑颗粒的溶蚀，形成的粒间和粒内孔隙不仅能增大孔隙度，而且能提高渗透率，可明显改善储层质量（孔隙度可达到20%以上，渗透率达到60×10-3 μm2）。显然，发现溶蚀作用及其形成的次生孔隙发育深度对于预测有利储层是非常重要的。根据济阳坳陷四个凹陷北部陡坡带沙河街组储层主控因素及其差异性特征分析，认为有机酸溶蚀有利于储层质量的改善，与此相关的有利储层发育深度主要位于2 200 m（惠民、东营和车镇凹陷北部）和2 900 m左右（沾化凹陷北部）深度段，溶蚀孔隙发育的三角洲河道砂体和近岸水下扇水道砂体是有利储层发育区和有利油气勘探目标。
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| 关 键 词： | 济阳坳陷 沙河街组 碎屑岩储层 成岩演化 质量差异 |
On the Differences of Reservoir Quality of Shahejie Fm. in Steep Slope Zones of Jiyang Sag |
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| Abstract: | Coarse sediments of nearshore subaqueous fan or fan delta were mainly developed in the third member or the forth member of Shahejie Formation in steep slope zones of different depressions in Jiyang sag, such as nearshore subaqueous fan in the north of Dongying depression (Li 88 well region) and Chezhen depression (Che 66 well region), delta in the north of Huimin depression (Jishan Sand Body), and fan delta in the north of Zhanhua depression (Yi 170 well region). But their sedimentary types and compositions were different. Great amounts of data from cores and reservoir analysis demonstrated that the reservoir of Shahejie Fm. had undergone a series of diagenesis, such as compaction, cementation, dissolution and replacement in burial diagenetic evolution, resulted in the low porosity and permeability reservoirs. Although it showed the similarity of the burial depth (mostly 2 000~3 000 m) and diagenesis evolution stages (the middle diagenetic phase) of Shahejie Fm. in Jiyang sag, differences of reservoir quality in these steep slopes of different depressions still existed. These kinds of differences were caused by sedimentary condition and diagenetic evolution differences. Under the same burial depth and diagenetic evolution stages, dissolution process had played a significant role in improving reservoir quality (the porosity up to 20% and the permeability up to 60×10-3 μm2). The comprehensive research results of reservoir controlling factors and characteristics indicated that, the favorable reservoirs of Shahejie Fm. in the steep slope of Jiyang sag developed in the depth about 2200m in Dongying, Chezhen and Huiming depressions, and the depth of 2 900 m in Zhanhua depressions. The channel sandbodies originated from delta and nearshore subaqueous fan, which were rich in dissolution pores, would be the favorable exploration targets in the future. |
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