鄂尔多斯盆地延安地区长4+5 油层组致密砂岩储层特征
网络出版日期: 2013-11-26
基金资助
陕西省自然科学基础研究计划项目“鄂尔多斯盆地致密砂岩油藏成藏物性下限研究”(编号:2013JM5007)和陕西省教育厅专项科研计划 项目“鄂尔多斯盆地延长组深层石油成藏机理研究”(编号:12JK0491)联合资助。
Characteristics of tight sandstone reservoir of Chang 4+5 oil reservoir setin Yan’an area, Ordos Basin
Online published: 2013-11-26
根据岩石薄片、铸体薄片、扫描电镜、黏土矿物X 射线衍射、压汞和物性分析等资料,对延安地区长 4+5 油层组致密砂岩储层特征进行了研究。结果表明:延安地区长4+5 油层组储层岩石类型主要为细粒 长石砂岩;孔隙度和渗透率分别为6.0%~10.0% 和0.2~2.0 mD,为典型的致密砂岩储层;储集空间主要 为残余粒间孔,其次为长石和浊沸石溶孔;孔隙结构以小孔细喉型为主,其次为小孔中细喉型和细孔微细 喉型;压实作用及绿泥石、方解石和浊沸石胶结作用是造成储层物性变差的主要因素,而溶蚀作用在一定 程度上改善了储层物性。该研究成果为延安地区长4+5 油层组致密砂岩油藏滚动勘探开发提供了地质 依据。
王伟力 , 高海仁 . 鄂尔多斯盆地延安地区长4+5 油层组致密砂岩储层特征[J]. 岩性油气藏, 2013 , 25(6) : 25 -29 . DOI: 10.3969/j.issn.1673-8926.2013.06.005
According to the data of rock thin section, cast thin section, scanning electron microscope, X diffraction of clay minerals, high pressure mercury and properties analysis, this paper studied the characteristics of tight sandstone reservoir of Chang 4+5 oil reservoir set in Yan’an area. The results show that the rock type of Chang 4+5 sandstone reservoir is mainly fine-grained feldspar sandstone; porosity and permeability range from 6.0% to 10.0% and 0.2 mD to 2.0 mD respectively, and the reservoir belongs to typical tight sandstone reservoir; reservoir space is mainly residual intergranular pores, followed by dissolved pores in feldspar and laumontite; pore structure is dominated by small pore and fine throat type, followed by fine throat and pore tiny throat type; compaction and cementation in chlorite, calcite and laumontite are the main factor for causing poor reservoir properties, and dissolution improves reservoir properties. The results of this study provide a geological basis for rolling exploration and development for Chang 4+5 oil reservoir set in Yan’an area.
Key words: tight sandstone; reservoir characteristics; natural gas; Permian; Ordos Basin
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