Seismic Structural Interpretation And Target Evaluation In The Southern Area Of Hejian

In this paper, taking Raoyang sag Hejiannan area as an example, on the basis of fine structural interpretation of 3D seismic data, combined with the research work well seismic structural interpretation and fault, and combined with drilling, oil field development dynamic data, seismic inversion results, the final trap evaluation and reservoir prediction of the target area, the delineation of favorable block, the drilling site. Raoyang is located in the eastern sag of Jizhong depression, Shenxian County uplift to the west east, Gaoyang low uplift, depression South sag deep county, north of the Ba County, Hebei area is the oil and gas accumulation, potential of exploration is high oil rich depression. In this paper, the research area is located in the central part of Raoyang depression, north of Balizhuang Qianshan oilfield, south of Liubei oilfield, west across the Hejian West trough meets the Suning oilfield.8kms wide, 12kms long from north to south, an area of about 100km2. The area of third lines were found four sets of oil-bearing series:Nm, Ng, Ed, Es2, the Ed is the main oil-bearing series, Nm, Es2 have a certain rolling exploration potential.First of all, this article in exploration seismology, tectonics theory as a guide, the use of automatic tracking, multi line, synthetic seismogram calibration, horizontal slice, dry body and velocity field is established and a series of fine structural interpretation technique, based on the detailed research area of drilling, logging, seismic data, seismic interpretation of 3-D of seismic data of 100km2 in the study area, the use of advanced technology and method to implement structure, accurate fault location, complete the marker bed fine structural map;Secondly, this paper takes the reservoir geology, seismic sedimentology theory as the guide, combined with the seismic attribute analysis technology, the paper carried on accumulation of oil, clear fault, the reservoir of oil and gas migration model and distribution of remaining oil. The area controlled by the main fault because of Hejian, on the west side of the formation of Hejian main source trough, large downthrown formed Hejian Dongying group reverse drag anticline, large fault rising plate formed Qianshan, Hejian Ma 851 Qianshan such a structure and the Qianshan. The specific geological conditions formed many oil-bearing strata, this region is a has many oil-bearing strata of the multiple oil-gas accumulation belt.Finally, based on the study of structure, reservoir, according to its configuration, combined with the characteristics of oil and gas enrichment, and implement the 24 traps, and focused on the trap are described and evaluated. The paper carried out, finally thought: (a) Hejian faults control the distribution of oil and gas in this region, the depth of Hejian fault distribution around the reservoir, mainly between Guantao and Minghuazhen Formation and the distribution of Hejian West fault. The potential of favorable target and remaining oil research should focus on the river around the fault. River area is a complex oil and gas accumulation zone of bedrock, sand reservoir, Qianshan sandstone reservoir, Dongying reservoir, Guantao formation and Minghuazhen reservoir. Away from the area to the east of the river fault, due to the lack of oil and oil source fault, Qianshan and three traps were not accumulation. (b)The main river of fault distance, fault stratigraphic thickness of two and the occurrence of the differences are large, so the lateral variation of velocity on both sides of the main faults of the great river. Drop plate in Hejian main faults, stratigraphic sequence is complete, the lateral variation of thickness of stratum is relatively stable speed. The rise in Hejian main fault, due to the lack of Dongying formation and the upper formation and Shahejie formation thickness, due to changes in the horizontal is larger, which leads to a change in the transverse velocity is large. In the study of speed, in different areas use different methods to calculate the formation velocity, blocks of building velocity field. Finally, the velocity field of the merger, the practice shows that this method can well restore the true structure shape, accurately find the structural highs.