鄂尔多斯盆地苏里格地区天然气勘探新进展

苏里格地区位于鄂尔多斯盆地伊陕斜坡西部，勘探面积约4×10⁴km²。最新研究成果表明，该区二叠系盒8段砂层发育，砂体具有毯式分布特征、岩相具有分带特点，发育3种储层类型，目标勘探应从砂体预测转向气层预测，勘探难度较大。经过近期的整体勘探，已累计发现了我国陆上超万亿立方米储量的整装大气田，在苏里格西区和南部勘探又有了新的发现。苏里格地区天然气成藏条件有利、资源量大、探明率较低，具有形成2×10¹²m³天然气探明地质储量的地质条件，苏里格西区是下一步提交天天然气规模储量的重点地区，苏里格南部则是重要的天然气储量增长接替区。

NEW PROGRESS ACHIEVED BY NATURAL GAS EXPLORATION IN SULIGE AREA

Sulige area is situated in the western Yi shaan slope of the Ordos Basin with an exploration area of 40,000 km2. From the latest study, three types of reservoirs have been discovered with sandstones formations well developed especially at the Permian He 8 in this area, sand bodies carpet like distributed with zonal lithofacies, and so the objective exploration should turn its forecast from sandbodies to gas pay zones, with a relatively high difficulty. The recent full scale exploration has found a large gas field with the reserves of 10 TCM, and new discoveries in the western and the southern part respectively in the Sulige area. This paper points out that since there are good conditions for gas accumulation with a huge resource (as abundant as 2 TCM of the explored reserves) but a rather low degree of exploration in this area, the western part should be the next important zone for a large discovery; while the southern part should become a succeeding main zone for increasing the gas reserves of the whole Sulige area.