Research On The Reservoir-forming Condition Of The Third And Forth Formation In The Denglouku Group Reservoir In The Yaoyingtai Region Of The Changling Fault Depression, Southern Songliao Basin

The former gas exploration of the Denglouku group gas reservoir in the Yaoyingtai region of the Changling Fault Depression, southern Songliao Basin has good hydrocarbon show, this paper deeply analysis the forming mechanism of Denglouku group gas reservoir from source 、reservoir、seal cover、entrapment、transport、preservation and other factors, at the same time this paper aims to reconstruct the burial history of various kinds of sandstones intersected in the YS201 well in the Yaoyingtai region of the Changling Fault Depression, southern Songliao Basin. Analyzed of fluid inclusions in the reservoir rocks, combined with the tectonic evolution history and reservoir fluid inclusion analysis technique, eventually revealed hydrocarbon accumulation stage and accumulation age of the Early Cretaceous Denglouku Group reservoir, which are the focus of future exploration for deep gas reservoirs in this region. With a large amount of collected data and large-scale data processing, to make sure that Denglouku Group reservoir is a type of bottom generation and top storing secondary gas reservoir. According to the reservoir comprehensive evaluation score, to determine the reservoir quality of different wells of Denglouku Group reservoir.Acoustic time data and sedimentary rates calculated for sediment in the YS201 well yield thicknesses for the Yingcheng, Nenjiang, and Mingshui groups of 506, 539.18, and 144.85 m, respectively, thereby revealing the burial history of the sediments in the well. Fluid inclusions of the Denglouku Group reservoir are mainly gas-liquid inclusions. The main peaks of the homogenization temperature and salinity of these saltwater inclusions in the Denglouku Group reservoir are generally 130–140 °C and 4–6 wt%. These two kind data for the reservoir show only one main peak, indicating that it experienced single-stage accumulation. Combining the homogenization temperature data for the reservoir fluid inclusions with the burial and thermal history of the sediments in the YS201 well, we infer that the hydrocarbon gas in this layer accumulated at 79 Ma(middle Late Cretaceous Nenjiang Group).