Abstract The Rongcheng High, located on the center of the Jizhong Depression, North China, presents favorable geothermal and geological characteristics, thereby rendering the fine subsurface structure crucial for accurately assessing seismic hazards and the potential for geothermal resources. In 2019, a recently acquired three-dimensional (3D) seismic dataset and processing methodologies were introduced to generate a high-resolution seismic reflection volume, centered on the Rongcheng High. The 3D reflection data revealed numerous prominent reflectors and associated fault structures, enabling a detailed study of the subsurface structure and providing an insight into the structural evolution of the Cenozoic Rongcheng High. A dissection of the fault system in the Rongcheng High unveiled a complex geometry characterized by both shallow and deep faults, indicating an initial phase of extension, followed by subsequent dextral strike-slip displacement. The Rongcheng Fault delineates the boundary between the Rongcheng High and Xushui Sag, influencing the fault sag and facilitating the development of a larger accommodation space. The depositional center shifted from west to east. The faults in the Cenozoic exhibited varying patterns of activity, beginning frequently in early Paleogene, followed by a decline, ultimately culminating in Neogene. The study area experienced two uplift events at the end of Ek2 (Kongdian-2 Formation) and Ed (Dongying Formation), resulting in the complete denudation of the Sha-2 and Dongying formations. A structural pattern characterized by alternating high and sag areas in the study area was established at the end of the depositional period of the Dongying Formation.
The study area is located in the southwest of China, with multi-layer gas and rich resources. There are challenges to the quality of seismic data in this mountainous survey area. The outcrop on the surface presented interbedded sand-shale and interlaced limestone-sandstone-mudstone and the subsurface structure distributes a narrow-steep anticline, which seriously affect the quality of seismic data. The resolution and imaging of seismic data are effectively improved by detailed near-surface Q survey, stimulating well depth design, the joint 3D surface seismic and VSP survey.
The eastern margin of Ordos Basin contains abundant tight sandstone gas resources, which has become the focus of petroleum exploration. However, the surface loess in this area is very thick, the absorption and attenuation are serious, the seismic signal to noise ratio is low, and the reservoir thickness is thin. How to improve the frequency of seismic data, broaden the bandwidth effectively, and improve the prediction accuracy of thin reservoirs and small faults has become a difficult problem to be solved in seismic exploration in the area. Through the development in the area based on the wide band and high sensitivity geophone single receiving and high folds seismic acquisition, avoid the combination of reducing the bandwidth, broaden the frequency band data, effectively improve the prestack inversion and thin reservoir, small fault identification accuracy.
'/%3e%3cuse xlink:href='%23a' transform='rotate(23.036 .093 25.536)'/%3e%3cuse xlink:href='%23a' transform='rotate(45.87 1.273 16.18)'/%3e%3cuse xlink:href='%23a' transform='rotate(69.945 .996 12.078)'/%3e%3cuse xlink:href='%23a' transform='rotate(20.66 -19.689 31.932)'/%3e%3c/svg%3e)
