陆相页岩孔隙发育特征及其控制因素——以莱阳凹陷水南组为例

发布时间：2018-07-12 09:13

本文选题：页岩气 + 莱阳凹陷　；参考：《科学技术与工程》2017年29期

【摘要】：为了研究莱阳凹陷陆相水南组页岩的孔隙发育特征,通过扫描电镜实验观察页岩孔隙微观形貌,高压压汞、低温液氮吸附及低温二氧化碳吸附实验对水南组页岩孔隙进行全尺度表征;并结合有机地化参数和矿物组成分析孔隙发育的控制因素。结果表明:扫描电镜镜下观察发现莱阳凹陷陆相页岩主要发育有机质孔、粒间孔、粒内孔及微裂隙等4种微观孔缝。高压压汞、低温液氮吸附及低温二氧化碳吸附实验联合表征发现孔隙连通性整体较好,孔隙形态以平行板状的狭缝形孔和细颈广体的墨水瓶形孔为主,孔径分布曲线呈多峰形态,大孔、中孔、微孔均发育较多,而比表面积主要由小于100 nm的孔隙,尤其以小于2 nm的微孔贡献为主。有机碳含量对孔隙发育有一定的控制作用,黏土矿物主要贡献中孔和微孔体积,石英、长石对大孔发育有积极的影响,而碳酸盐矿物会胶结堵塞孔隙,造成大孔、中孔及微孔体积均减小,对孔隙发育为消极的影响。
[Abstract]:In order to study the pore development characteristics of shale in the continental Shuinan formation in Laiyang Sag, the pore morphology of shale was observed by scanning electron microscope (SEM). Low temperature liquid nitrogen adsorption and low temperature carbon dioxide adsorption experiments were used to characterize the shale pores in Shuinan formation on a full scale, and the controlling factors of pore development were analyzed with organic geochemical parameters and mineral composition. The results show that there are four kinds of microfractures in the continental shale of Laiyang sag, such as organic pore, intergranular pore, intragranular pore and microfracture. High pressure mercury injection, low temperature liquid nitrogen adsorption and low temperature carbon dioxide adsorption experiments showed that the pore connectivity was good, and the pore morphology was mainly parallel plate slit pore and fine necked wide body ink bottle pore. The pore size distribution curve shows multi-peak shape, with more macropores, mesoporous pores and micropores, while the specific surface area is mainly composed of pores less than 100 nm, especially the micropores less than 2 nm. Organic carbon content can control pore development, clay minerals mainly contribute to mesoporous and micropore volume, quartz and feldspar have a positive effect on macropore development, while carbonate minerals cement pores, resulting in macropores. The volume of mesopore and micropore decreased, which had a negative effect on pore development.
【作者单位】：中国矿业大学煤层气资源与成藏过程教育部重点实验室;中国矿业大学资源与地球科学学院;
【基金】：国家自然科学基金(41272155) 山东省页岩气形成条件研究项目(LDYGZC-2015022)资助
【分类号】：P618.13

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