Study on Sand Bodies Controlled by Growth Faults in Xiaermen Area of Biyang Sag

Xiaermen area of Biyang sag is rich in oil and gas resources. The reservoir type is mainly fault-lithologic reservoir. The configuration relationship between fault characteristics and sand body distribution is the main controlling factor of oil and gas exploration in this area. Based on 3D seismic, drilling, logging and core data, taking the Small layer 1 of Ⅳ oil formation in the third member of Paleogene Hetaoyuan Formation (Eh3Ⅳ1) as an example, through structure analysis, quantitative analysis of fault activity and characterization of sand body distribution characteristics, this paper analyzes the distribution characteristics of Braided River Delta sand body controlled by growth fault from the perspective of tectonic activity sedimentary response. The results show that a series of North dipping growth normal faults with SW-NE turning to E-W strike are mainly developed in Xiaermen area. The profile forms a stepped fault combination, and the activity of each fault is obviously different along the strike. The study area mainly develops Houzhuang braided river delta front subfacies and pre delta subfacies. The underwater distributary channel sand body from the north is easy to pass through the fault transition zone or the weak part of the same fault activity, but is limited or turned in the strong part. Vertically, sand bodies in areas with weak activity are vertically continuously superimposed and thickened, while sand bodies in areas with strong activity are vertically intermittently dispersed and thinned. This study can provide some reference for the understanding of sand body distribution law and exploration & development in the low order growth fault development area of the eastern fault basin.