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柴达木盆地三湖地区第四系的形成是在第三纪末期新构造运动作用下,盆地沉积中心由西向东整体迁移的产物,在第四系中发现了世界上最大的生物气田。近年来三湖地区发现岩性气藏,将现已发现的岩性气(层)藏分为砂岩上倾尖灭型、砂岩透镜体型和物性侧向变化型3种。并提出岩性气藏分布规律是:分布于北斜坡,依附于构造背景,位于k9标志层以下,赋存于薄层砂体中,限于一定的深度范围内。根据分布规律,提出三湖地区岩性气藏的有利勘探区块,为研究区下一步进行岩性气藏勘探提供了理路依据和现实依据。
The Quaternary formation in the Sanhu area of the Qaidam basin was the product of the migration of the sedimentary center of the basin from west to east under the action of Neotectonics in the end of the Tertiary. In the Quaternary, the largest biogas field in the world was discovered. In recent years, lithologic gas reservoirs have been found in the Three Lake regions. The lithologic gas reservoirs that have been found are classified into upward dipping sandstone type and lateral and lateral types of sandstone lenses. It is also proposed that the distribution of lithologic gas reservoirs is distributed in the northern slope, attached to the tectonic setting and located below the k9 mark, which occurs in thin sand bodies and is limited to a certain depth. According to the distribution law, the favorable exploration blocks of lithologic gas reservoirs in the Three Lake region are put forward, which provide the rationale and realistic basis for the further exploration of lithologic gas reservoirs in the study area.