胶莱盆地页岩气成藏条件研究

发布时间：2018-06-21 00:31

本文选题：胶莱盆地 + 水南组　；参考：《中国矿业大学》2015年硕士论文

【摘要】：胶莱盆地发育有多套富有机质泥页岩,其中水南组富有机质泥页岩发育良好,具有较好的页岩气成藏地质条件。本文以胶莱盆地水南组富有机质泥页岩为研究对象,通过资料收集-野外地质调查-实验测试-理论分析,对研究区水南组页岩气成藏条件展开系统研究,结果表明:水南组为一套半深湖-深湖相沉积,岩性组合以页岩、粉砂岩和泥灰岩为主,总厚度介于50~200m,目前埋深主体位于1000~3000m,最大可达5000m。泥页岩有机质类型以II型为主,次为Ⅲ型;有机质丰度主体位于0.15~4.00%;有机质成熟度介于0.8~1.6%,主体位于1.0~1.4%,已进入成熟阶段。矿物成分以黏土矿物和石英为主,脆度与中国南方下古生界海相页岩相当。气体最大吸附量介于1.34~2.09m3/t,平均为1.67m3/t。水南组泥页岩发育有机质孔、粒内孔、粒内溶蚀孔和粒间孔等类型。孔径主要集中在微孔和小孔范围,孔隙度一般为4.0~10.0%。泥页岩储层裂缝主要以天然微裂缝为主,是吸附气由解析到游离的主要通道,有利于页岩气的运移。水南组页岩气成藏主控因素概括为以下几个方面:沉积环境控制了水南组页岩气成藏的物质来源、有效厚度、有机质丰度等;黏土矿物为页岩气吸附提供了大量的微孔隙体积和比表面积,脆性矿物可以增强页岩的脆度和造缝能力;构造埋藏作用促进页岩中的有机质生烃,构造拉张挤压使页岩中发育大量的裂隙,影响页岩气的运移和聚集;孔隙结构和类型影响页岩气的游离和吸附状态,尤其是有机质孔对页岩气的赋存影响最大。综合评价,认为胶莱盆地具有较好的页岩气资源前景,其中桃村凹陷、莱阳凹陷深部、夏格庄洼陷东部、诸城凹陷深部以及平度洼陷北部,页岩气成藏条件好,具备页岩气勘探开发前景。
[Abstract]:There are many sets of organic shale rich in organic matter in Jiulai basin, of which the organic shale of Shuinan formation is well developed, and has good geological conditions of shale gas reservoir formation. Taking the organic shale of the Shuinan formation in Jiaolai Basin as the research object, through data collection, field geological investigation, experimental test and theoretical analysis, the conditions of shale gas accumulation in Shuinan formation in the study area are studied systematically. The results show that the Shuinan formation is a set of semi-deep lacustrine-deep lacustrine facies deposits, with shale, siltstone and marlite as the main lithologic assemblages, with a total thickness of 50 ~ 200m. At present, the buried depth is located at 1000m ~ 3000m, with a maximum of 5000m. The type of organic matter of shale is mainly type II, the third type, the abundance of organic matter lies at 0.154.00, the maturity of organic matter is between 0.8 and 1.6, and the main body is at 1.0 and 1.4, which has entered the mature stage. The mineral composition is mainly clay and quartz, and its brittleness is equivalent to that of lower Paleozoic marine shale in southern China. The maximum adsorption capacity of gas is between 1.34 and 2.09 m3 / t, with an average of 1.67 m3 / t. The shale of the Shuinan formation developed organic pore, inner-particle corrosion pore and intergranular pore. The pore size is mainly concentrated in micropores and micropores, and the porosity is generally 4.0 ~ 10.0. The main fractures in shale reservoir are natural microfractures, which are the main channels of adsorptive gas from analytic to free, which is beneficial to the migration of shale gas. The main controlling factors of shale gas accumulation in Shuinan formation are summarized as follows: the sedimentary environment controls the material source, effective thickness and abundance of organic matter of shale gas reservoir in Shuinan formation; Clay minerals provide a large amount of micropore volume and specific surface area for shale gas adsorption, brittle minerals can enhance the brittleness and fracture ability of shale, and structural burial can promote hydrocarbon generation of organic matter in shale. Structural tensioning and squeezing make a large number of fractures develop in shale, which affect the migration and accumulation of shale gas, and pore structure and type affect the free and adsorption state of shale gas, especially the pore of organic matter has the greatest influence on the occurrence of shale gas. The comprehensive evaluation shows that Jialai Basin has a good prospect of shale gas resources, including Taocun depression, Laiyang sag, eastern Xiagezhuang sag, deep Zhucheng sag and northern Pingdu sag, and good conditions for shale gas accumulation. Shale gas exploration and development prospects.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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