When used to surface geochemical exploration, it can predict and judge the position and properties of the transverse profile of the oil-gas zone.

Up to now a whole series of methods and(indicators) have been set up so as to detect the physical,chemicalandbiologicalchanges related to hydrocarbon microseep in surface environment.

The surface structure in West China is complicated and variable,which influences not only excitation and receiving in seismic exploration,thus making it hard to get original data with high SNR in field acquisition,but also seismic data imaging and amplitude fidelity processing.

Effect of excavation on sedimentation deformation of surrounding ground surface in deep foundation pit

Based on the running tunnel of Yuexiu park and Sanyuanli in Guangzhou metro line 2,the influence of in-situ stress release on the stability of surrounding rock masses and ground surface settlement for shield-driven tunnel is analysed by using the elastoplastic finite element method.

Factors affected the data quality include the Quaternary washings covering the earth surface, unconsolidated rocks, shallow depth of targets, enriched minor faults, and ambient noises.

General situation of Yangtzi River Tunnel Crossing Project for Anqing Gas Transmission Pipeline is introduced from closing structure of receiving well and sending well, geologic profile and hydrogeological environment, principle of shield-driven tunneling and influence of hydrogeological environment onconstruction, earth surface and barrier settlement are analyzed.

Utilizing the principle of asking centroid and aiming at the common topographical surface feature in high-accuracy gravity measurement, a topographic correction method near gravity survey districts is provided in this paper.