To address the common challenges of rheological deterioration，excessive fluid loss，and wellbore instability for drilling fluids under high temperature，high salinity，and high stress conditions in ultra-deep wells，a cationic nanogel viscosifier and plugging agent，P（AM-DMC），was designed and synthesized from acrylamide （AM） and methacryloxyethyltrimethylammonium chloride （DMC） via inverse suspension polymerization. This material combines the viscosity-enhancing property of flexible polymer chains with the high interfacial activity and size effects of nano-particles. Scanning electron microscopy （SEM） showed the material has an irregular polyhedral morphology and a particle size distribution of 200-500 nm. The performance of the developed material was systematically evaluated in a low solid water based drilling fluid，including rheology，filtration control，and salinity tolerance，while the contact angle and Zeta potential measurements were used to reveal the micro-interfacial properties. The material exhibited high hydrophilicity （a contact angle of 13°） and excellent dispersion stability，facilitated by its strong positive surface charge （Zeta potential of +59.1 mV），which forms the basis of the synergistic viscosity-enhancing and plugging mechanism. Results demonstrated that P（AM-DMC） significantly improves the structural viscosity and shear resistance capacity of the drilling fluid through strong electrostatic adsorption between its cationic chains and clay particles，along with the formation of a three-dimensional network of the materials. Increasing the dosage of P（AM-DMC） markedly enhanced the apparent viscosity and yield point while significantly reducing both API and HTHP fluid loss. The system maintained excellent rheological stability and low fluid loss after aging at 170°C，confirming its outstanding thermal stability. It is indicated that P（AM-DMC） nanogel is a novel additive for high-performance drilling fluids in deep complex formations，offering efficient viscosity enhancement，fine plugging，and superior temperature resistance and thus holding significant engineering value for the safe and efficient drilling of ultra-deep wells.

Due to the complex surface seismic geological conditions and complex deep seismic wave field and structural characteristics，the overall seismic data signal-to-noise ratio in the southern margin of the Junggar Basin is low，making it difficult to accurately analyze the structure，which has seriously affected the oil and gas exploration process. With the significant breakthrough of the GT1 well in the lower combination，the overall deployment of the area has implemented wide azimuth，wide bandwidth and high density seismic exploration project covering more than 3 800 km² in steps over the past five years. In the seismic data acquisition phase of these exploration projects，a series of targeted technologies have been applied，including surface conglomerate survey techniques，laser radar aerial information—assisted shot points pre-design，and well-seismic mixed source efficient acquisition techniques. These technologies have enabled the annual increase in shot density within the affordable cost range. After several years of integrated technical breakthroughs，the imaging effect of seismic data in this area has been greatly improved，and the well-seismic error has been significantly reduced. The seismic acquisition technology in the dual complex area on the southern margin of the Junggar Basin is of great reference significance for similar seismic acquisition projects in exploration areas.

With the application of horizontal well and hydraulic fracturing technology in the development process of shale oil in Xinjiang Oilfield， there have emerged more and more casing deformation cases， which bring huge economic loss. In addition， other problems such as abnormal fracturing operation， missing well sections and low individual well production also arise. In this paper， a relevance model is established by analyzing the geophysical response characteristics where casing deformation occurs， so that casing deformation can be predicted using the three-dimensional seismic attributes to optimize the fracturing program before a horizontal well is subjected to fracturing. Consequently， early warning for casing deformation during fracturing becomes possible after combing with monitoring results of microseismic to guide fracturing operation， which minimizes the occurrence of casing deformation， improves the effect of reservoir fracturing， and enhances the production of individual wells.