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鄂尔多斯盆地姬塬地区长6段致密砂岩中黏土矿物对储层物性的影响

发布时间:2019-01-12 09:28  文章来源:笔耕文化传播
【摘要】:黏土矿物在鄂尔多斯盆地姬塬地区长6段各小层中均有分布,是该区致密砂岩储层中主要的填隙物,对储层物性有重要的影响。利用铸体薄片、压汞、扫描电镜(SEM)、X-射线衍射(XRD)等实验测试技术,分析储层岩石学特征认为,长6段是以长石岩屑砂岩和岩屑长石砂岩为主的低孔低渗的致密储层,其平均孔隙度为7.78%~9.13%,平均渗透率为(0.20~0.34)×10-3μm2。重点分析黏土矿物与储层物性之间的关系认为,高岭石和绿泥石是长6储层中主要的黏土矿物,对储层物性的影响较为复杂。少量的高岭石和绿泥石往往预示着储层孔隙度较好,而过量的高岭石(绝对含量7%)和绿泥石(绝对含量10%)则会大大降低储层的孔隙度。通过计算,长6储层原始孔隙度为41.13%~42.04%,高岭石充填导致砂岩孔隙度降低4.52%~4.78%,其损失率为10.74%~11.38%;绿泥石对长6段砂岩孔隙度的影响仅次于高岭石,导致孔隙度降低4.12%~4.70%,其损失率为9.81%~11.18%。自生高岭石对砂岩渗透率有一定的建设性作用,而绿泥石则导致砂岩渗透率降低。长6储层中伊利石含量较高岭石和绿泥石含量低,但由于其主要以丝缕状呈搭桥式充填孔隙,导致孔隙度和渗透率均有所降低,其孔隙度降低1.33%~2.08%,损失率为3.17%~4.94%。因此,在姬塬地区长6段致密储层中,黏土矿物对孔隙度的影响程度为:高岭石绿泥石伊利石。
[Abstract]:Clay minerals are distributed in each sublayer of Chang 6 member in Jiyuan area, Ordos Basin, which is the main interstitial material in tight sandstone reservoir in this area, and has an important influence on reservoir physical properties. By using the techniques of casting thin sheet, mercury injection and scanning electron microscope (SEM),) X-ray diffraction (XRD), the petrological characteristics of the reservoir are analyzed. Chang 6 is a compact reservoir with low porosity and low permeability mainly composed of feldspathic sandstone and lithic feldspathic sandstone. Its average porosity is 7.78 ~ 9.13 and its average permeability is (0.20 ~ 0.34) 脳 10 ~ (-3) 渭 m ~ (2). It is considered that kaolinite and chlorite are the main clay minerals in Chang 6 reservoir and the influence on reservoir physical properties is complex. A small amount of kaolinite and chlorite often indicate that the reservoir porosity is good, while excessive kaolinite (absolute content 7%) and chlorite (absolute content 10%) will greatly reduce the reservoir porosity. Through calculation, the original porosity of Chang 6 reservoir is 41.13 and 42.044.The kaolinite filling results in the decrease of sandstone porosity by 4.52 and 4.78, and the loss rate is 10.74 and 11.38. The effect of chlorite on the porosity of Chang 6 sandstone is second only to kaolinite, which leads to the decrease of porosity by 4.12% and the loss rate is 9.81% and 11.18%. Authigenic kaolinite plays a constructive role in sandstone permeability, while chlorite leads to sandstone permeability decreasing. The content of Illite in Chang 6 reservoir is lower than that of kaolinite and chlorite. However, the porosity and permeability of Chang 6 reservoir are decreased due to the bridge filling, and the porosity of Chang 6 reservoir is decreased by 1.33 and 2.08, and the content of Illite in Chang 6 reservoir is lower than that of kaolinite and chlorite. The loss rate is 3.17 and 4.94. Therefore, in the tight reservoirs of Chang 6 member in Jiyuan area, the influence of clay minerals on porosity is as follows: kaolinite chlorite Illite.
【作者单位】: 甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室;中国科学院大学;
【基金】:中国科学院兰州油气资源研究中心“十三五”创新基金(编号:135CCJJ20160510);中国科学院创新促进会会员人才计划项目(编号:Y410ST1LST)联合资助
【分类号】:P618.13

【参考文献】

相关期刊论文 前10条

1 任大忠;孙卫;黄海;刘登科;屈雪峰;雷启鸿;;鄂尔多斯盆地姬塬油田长6致密砂岩储层成因机理[J];地球科学;2016年10期

2 汪洋;李树同;牟炜卫;闫灿灿;;姬塬西部地区长8_1致密储层特征及孔隙度演化分析[J];岩性油气藏;2016年04期

3 李超正;柳广弟;曹U,

本文编号:2407619


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