博格达山山前带芦草沟组不同岩相储集特征及含油性

doi:10.7657/XJPG20200404

摘要/Abstract

摘要：

为了提高页岩油“甜点”储集层钻遇率,实现页岩油高效动用开发,亟需开展页岩油储集层储集空间、孔隙结构和含油性研究。以准噶尔盆地东南缘博格达山山前带中二叠统芦草沟组为研究对象,综合运用岩石薄片、X射线衍射全岩矿物分析和场发射环境扫描电镜等储集层表征技术,结合有机地球化学测试分析,分析了不同岩相的储集空间类型及其页岩油赋存特征。结果表明,芦草沟组岩石类型复杂,表现为混合沉积特点,可划分出泥页岩相、砂岩相和碳酸盐岩相3类岩相;不同岩相的储集空间和孔隙结构控制了含油性,游离态页岩油主要赋存在孔径大于30 nm的孔隙中,基质型泥页岩相储集层储集空间包括黏土矿物晶间孔、碳酸盐矿物晶间孔、有机质孔、层理缝、构造裂缝、超压缝等,其中,无机矿物和干酪根表面以吸附态页岩油为主,粒间孔、有机质孔和层理缝中以游离态页岩油为主;夹层型砂岩相和碳酸盐岩相储集层储集空间以粒（晶）间孔、粒（晶）间溶孔、粒（晶）内溶孔等为主,页岩油以游离态为主赋存于各类微米级孔隙中;基质型岩相富含有机质,随着有机质丰度增加,干酪根吸附态烃量增加,有机碳含量与可动烃含量呈幂函数关系,夹层型岩相有机碳含量相对较低,以外来烃充注为主,有机碳含量与可动烃含量呈线性关系。奇台庄地区和柴窝堡凹陷中北部地区为页岩油有利储集层发育区,芦三段夹层型岩相页岩油可动烃含量高,易于开发动用,为重要的勘探目标。

关键词: 准噶尔盆地, 博格达山, 芦草沟组, 页岩油, 赋存形式, 岩相, 储集空间, 含油性

Abstract:

In order to improve the success rate of penetrating sweet spots of shale oil reservoirs and to realize the efficient producing and development of shale oil, it is necessary to study the reservoir space, pore structure and oil content of shale oil reservoir. Taking the Middle Permian Lucaogou formation in the piedmont belt of Bogda mountain in the southeastern Junggar basin as the research object, using the reservoir characterization technologies such as rock thin section analysis, X-ray diffraction whole-rock mineral analysis and field emission-environment scanning electron microscope and combining with the organic geochemical experiments, the paper analyzes the reservoir spaces and shale oil occurrences of different lithofacies. The results show that the Lucaogou formation is dominated by mixed depositions of shale, sandstone and carbonate rocks. The reservoir spaces and pore structures of different lithofacies control the oil-bearing properties of the reservoir. Free-state shale oil mainly occurs in the pores with the pore diameters more than 30 nm. The reservoir spaces of the shale mainly include intercrystalline pores in clay minerals, intercrystalline pores in carbonate minerals, pores in organic matters, bedding fractures, structural fractures and overpressure fractures. Adsorbed shale oil occurs on the surfaces of inorganic minerals and kerogen, while free-state shale oil occurs in the intergranular pores, organic matter pores and bedding fractures. The reservoir spaces of sandstone and carbonate rock in the interlayers are dominated by intergranular (intercrystalline) pores, intergranular (intercrystalline) dissolved pores, and intragranular (intracrystalline) pores. Free-state shale oil mainly occurs in all kinds of nano-pores. Organic matter enriches in the lithofacies of matrix. As the abundance of the organic matter increases, the amount of adsorbed hydrocarbons in kerogen increases, and the organic carbon content shows a power function relationship with the contents of movable hydrocarbons. The lithofacies in the interlayer have relatively low organic carbon contents which show linear relationships with the contents of movable hydrocarbons. Qitaizhuang area and the central and northern areas of Chaiwopu sag are favorable shale oil reservoir development areas, and the shale oil in the lithofacies of the interlayers in the third member of Lucaogou formation have high contents of movable hydrocarbons, which can be exploited easily and should be considered as the key target for exploration.

Key words: Junggar basin, Bogda Mountain, Lucaogou formation, shale oil, occurrence, lithofacies, reservoir space, oil-bearing property

中图分类号:

TE122

王圣柱. 博格达山山前带芦草沟组不同岩相储集特征及含油性[J]. 新疆石油地质, 2020, 41(4): 402-413.

WANG Shengzhu. Reservoir Characteristics and Oil-Bearing Properties of Different Lithofacies of Lucaogou Formation in the Piedmont Belt of Bogda Mountain[J]. Xinjiang Petroleum Geology, 2020, 41(4): 402-413.

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