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塞云——马西拉盆地是在板块分离产生的剪切应力场背景下拉张形成的一种被动裂谷盆地,不同于地幔上涌产生的主动裂谷。裂谷纵向上发育强——弱两期裂陷作用,发育2套生油岩,其中第一裂谷期Madbi组黑色泥岩是盆地的主力生油层。以下Qishn段砂岩为储层,上Qishn段致密灰岩为区域盖层的组合是盆地内的主要成藏组合,主要圈闭类型为反向断层翘倾断块、古潜山和背斜等。研究表明,塞云——马西拉盆地具有优越的油气成藏条件和较好的勘探前景。
The Permian-Masila Basin is a passive rift basin that stretches in the background of the shear stress field generated by the plate separation and is different from the active rifting caused by upwelling of the mantle. In the rift, two sets of oil-generating rocks were developed in the strong-weak two-stage rifting. The Madick black mudstone in the first rifting stage was the main oil producing layer in the basin. The following Qishn sandstones are reservoirs, and the combination of tight limestone in the upper Qishn segment is the main reservoir-forming assemblage in the basin. The main trap types are reverse faulted upturned blocks, buried hills and anticlines. The study shows that the Seiyun-Masila Basin has superior hydrocarbon accumulation conditions and better exploration prospects.