| | Stratum name | Stratigraphic characteristics |
| | Taiyuan Formation | There is no sediment in the north of the fault, which is mostly in the south of the fault. The lithology is diverse, mud and sand are mixed, and coal seam and mudstone are well developed. It has strong hydrocarbon generation ability, which provides good source rock conditions for natural gas accumulation. | | Shanxi Formation | It is later than Taiyuan Formation, and its distribution range is relatively large. The lithology has certain stratification characteristics in the vertical direction, with mudstone, coal seam, and a small amount of fine sandstone in the upper part. Coal seam and mudstone have certain influence on the natural gas accumulation in this area. The lower part is sandstone and glutenite, with relatively good reservoir properties, providing good reservoir conditions. | | Xiashihezi Formation | Widely distributed on the plane, basically distributed in the whole study area. Vertically, it is composed of members 1, 2, and 3, and the lithology is mainly sandstone, mixed with a certain amount of mudstone. Lower Shihezi Formation sandstone has the best reservoir property and is the most important reservoir in this area. | | Shangshihezi Formation | It is widely distributed on the plane, and its lithology is sandstone and mudstone. The mudstone has a large thickness, with a total thickness of over 100 meters, and it has a good sealing capacity, which provides a good capping condition for natural gas accumulation. | | Shifeng Formation | It covers the whole area on the plane, and the lithology is mainly sandstone and mudstone. As a regional caprock, mudstone has a larger thickness and stronger sealing capacity. |
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