Abstract
The Hangjinqi area was explored for natural gas around 40 years ago, but the efficient consideration in this area was started around a decade ago for pure gas exploration. Many wells have been drilled, yet the Hangjinqi area remains an exploration area, and the potential zones are still unclear. The Lower Shihezi Formation is a proven reservoir in the northern Ordos Basin. This study focuses on the second and third members of the Lower Shihezi Formation to understand the controlling factors of faults and sedimentary facies distribution, aimed to identify the favorable zones of gas accumulation within the Hangjinqi area. The research is conducted on a regional level by incorporating the 3D seismic grid of about 2500 km2, 62 well logs, and several cores using seismic stratigraphy, geological modeling, seismic attribute analysis, and well logging for the delineation of gas accumulation zones. The integrated results of structural maps, thickness maps, sand-ratio maps, and root mean square map showed that the northwestern region was uplifted compared to the southern part. The natural gas accumulated in southern zones was migrated through Porjianghaizi fault toward the northern region. Well J45 from the north zone and J77 from the south zone were chosen to compare the favorable zones of pure gas accumulation, proving that J45 lies in the pure gas zone compared to J77. Based on the faults and sedimentary facies distribution research, we suggest that the favorable zones of gas accumulation lie toward the northern region within the Hangjinqi area.
Highlights
The Ordos Basin (OB), located in central China, is one of the most productive and petroliferous craton basins with the highest annual gas output in China (Yang et al, 2005; Xu et al, 2018; Wang et al, 2020)
Our study is focused on the Hangjinqi area, which is situated in the Yimeng Uplift and northern Yishan slope, covering an area of 9825 km2 within northern Ordos Basin (Wu et al, 2017) (Figure 1A)
The research has been conducted on the Middle Permian sediments of the second and third members of the Lower Shihezi Formation interpreted as T9e (P2x2) and T9f (P2x3) within the Hangjinqi area, northern Ordos Basin, China
Summary
The Ordos Basin (OB), located in central China, is one of the most productive and petroliferous craton basins with the highest annual gas output in China (Yang et al, 2005; Xu et al, 2018; Wang et al, 2020). Gas Accumulation Zones of Hangjinqi incorporate Sulige, Yulin, Changqing, Jinbian, and Daniudi gas fields (Duan et al, 2008; Yang et al, 2015a). Our study is focused on the Hangjinqi area, which is situated in the Yimeng Uplift and northern Yishan slope, covering an area of 9825 km within northern Ordos Basin (Wu et al, 2017) (Figure 1A). Hangjinqi area offers essential geologic conditions for making a large-scale gas reservoir, and is a potential area for becoming a vast gas exploration zone (Anees et al, 2019). We are focusing on understanding the controls of faults and sedimentary facies distribution with the help of geological modeling, seismic stratigraphy, seismic attribute analysis, and petrophysical analysis on the second and third members of LSF in the Hangjinqi area
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