鄂尔多斯盆地下寺湾地区三叠系下组合地层石油地质特征及勘探方向

Oil Geological Characteristics and Exploration Trend of Triassic Lower Group in Xiasiwan Area of Ordos Basin

三叠系延长组上组合地层作为下寺湾油田的主力油层段,经过数十年的勘探开发,其后备资源日显不足。通过对近年来下寺湾地区探井含油层段的分析研究,发现三叠系延长组下组合地层长7-长10段具有较好的油气显示。本文针对延长组下组合地层长7、8段,对其沉积微相、砂体形态、储盖组合、构造形态、岩性组合特征进行分析探讨,为下寺湾油田持续稳步发展寻找到层系接替资源。

Triassic upper group of the Yanchang Formation in Xiasiwan oilfield,as the next section of the main reservoir,after decades of exploration and development,its reserve resources become increasingly inadequate.By analysis on oil-bearing section in the Xiasiwan area in recent years,we found that the lower group of Triassic Yanchang Formation Chang 7-Chang10 segments showed good oil and gas resources.By discussing the sedimentary facies,sand body shape,reservoir-cap,structural features,lithological assemblage of the lower group of Yanchang Formation under section Chang 7-8,we can find layer system replacement resources for the steady development of Xiasiwan oilfield.