Seismic attribute analysis is an efficient and effective method to predict reservoir, but the strong ambiguity of the seismic single attribute for reservoir prediction may reduce the accuracy of prediction obviously, especially for the fault basin which has characteristics of multisource, facies changing fast, multiple episodes of volcanic activities, and the complex ingredients of rocks. The reservoir prediction for the technology of seismic multi attribute fusion is given. Firstly to use seismic waveform classification technique to divide study area into different regions according to sedimentary characteristics, then count the correlation coefficient of the seismic multiple attributes and reservoir information for different regions, besides to use linear fitting. Finally, using the fitting results of each region to summarize the result of reservoir prediction in the whole region. In the reservoir prediction of Nantun baer sag in Hailar Basin, with using sand ratio data of 164 wells in the target stratum and 7 selected seismic attributes, adopting gradually linear regression method to do fitting in the whole area, the correlation coefficient is only 0.52.

This study aims to elucidate the developmental characteristics of strike-slip fault-controlled Ordovician fault-karst reservoirs (FKRs) in the Yuman area of the Tarim Basin. By integrating regional tectonic settings with high-resolution 3D seismic data, we implemented a comprehensive 3D seismic interpretation strategy. Concurrently, a statistical evaluation of 22 strike-slip fault segments was conducted based on their kinematic attributes, connectivity, and seismic “string-of-beads” responses. The results indicate that the Yuman area is dominated by an interlaced network of NE-striking (sinistral transpressional) and NS-striking (dextral transpressional) faults. Three distinct reservoir-controlling patterns were identified among the 22 FKRs: Type I deep-penetrating transpressional (7 segments), Type II deep-penetrating transtensional (4 segments), and Type III weakly penetrating transpressional (11 segments). Based on reservoir scales and structural positioning, seven high-priority exploration targets were successfully delineated. Furthermore, the results reveal that fault structural maturity, vertical penetration, and kinematic regimes are the pivotal factors controlling FKR quality and stratigraphic distribution. Type I patterns exhibit the highest structural maturity and develop cross-stratigraphic, large-volume reservoirs in shallow sections, representing prime targets. Conversely, Type III reservoirs are deeply buried due to constrained fault growth. Ultimately, reservoir evaluation priority ranges from Type I, through Type II, to Type III, with Targets ① to ④ identified as the most promising candidates for localized exploration breakthroughs.

Huoduomoer structural zone is one of the most favorable oil and gas accumulation zones in Beier depression of Hailaer basin. However, the exploration in this zone has experienced a long and tortuous process, and the exploration is almost stagnant until the natural production capacity of well x1 has obtained daily output of 472m³, which has achieved a major breakthrough in the exploration of tectono-stratigraphic and stratigraphic unconformity reservoirs in this structural zone. Based on the comprehensive study of the subdivided layers of the structural belt, this paper holds that the Nantun Formation suffered from long-term denudation after deposition, the Nantun Formation at the high part of the uplift belt was denuded completely, and the remaining Nantun Formation at the periclinal area was the main target layer for exploration. Based on the analysis of the main controlling factors of hydrocarbon accumulation, it is considered that feldspar lithic sandstone and lithic sandstone mainly developed in the subaqueous distributary channel deposition of braided river delta front are easy to be leached and eroded, forming high-quality reservoir with secondary porosity near the unconformity surface, and the multi-direction oil and gas migration system is the key to the oil and gas accumulation; the stable and thick mudstone deposition in the large section provides a good sealing condition for traps.