论文部分内容阅读
处于有机质成熟阶段以生油为主的页岩储层中的油溶相页岩气是目前页岩气资源研究的薄弱环节。根据相似相溶的原理,影响油溶相页岩气量的主要因素为页岩储层中残留油含量和天然气在残留油的溶解度。通过有机地球化学分析测试、储层物性分析测试和等温吸附实验,并利用测井解释方法,对鄂尔多斯盆地下寺湾地区长7段页岩油溶相页岩气含气性影响因素及有利层段空间分布特征进行了分析。研究表明下寺湾地区长7段页岩具备油溶相页岩气大量生成的地质基础;下寺湾地区长7段油溶相页岩气含气量较大,介于0.18~0.52m3/t之间,平均为0.34m3/t,占总含气量的9%;研究区长73亚段是油溶相页岩气发育的最优层段,研究区长73亚段西南部油溶相页岩气含气量大于0.5m3/t,是油溶相页岩气发育的最有利区域。因此,在对鄂尔多斯盆地下寺湾地区长7段页岩气进行资源评价时,油溶相页岩气是值得重视的页岩气资源。
The oil-dissolved shale gas in the shale reservoirs that are mainly oil-bearing in the mature stage of organic matter is the weakest link in shale gas resources research. According to the principle of similar compatibility, the main factors affecting shale gas volume in oil-bearing phase are the residual oil content in shale reservoirs and the solubility of natural gas in residual oil. By means of organic geochemical analysis test, physical property analysis test and isothermal adsorption experiment, and logging interpretation method, the influence factors of shale gas-bearing shale gas in Chang 7 Member of Xia-Si Bay area in Ordos Basin and the favorable layer The spatial distribution of segments was analyzed. The study shows that the Chang 7 Member Shale in Xiajianwan area has the geological basis for the large-scale formation of oil-bearing shale gas. The oil-bearing shale gas in the Chang 7 Member of Xiaansiwan area is relatively large, ranging from 0.18 to 0.52m3 / t , With an average of 0.34m3 / t, accounting for 9% of the total gas content. The study section 73, the sub-section of the study area, is the optimal section for the development of shale gas in oil-bearing facies. The gas content of rock gas is more than 0.5m3 / t, which is the most favorable area for oil shale gas development. Therefore, oil shale gas is a shale gas resource worthy of attention when evaluating the resource of shale gas in Chang 7 section of Xia-Si-Wan area in the Ordos Basin.