CHARACTERISTICS OF THE DEEP FORMATIONS IN SHUANGLIAO FAULT DEPRESSION

On the basis of seismic, drill hole and well logging data, the Houshiling, Shahezi and Yingcheng formations in Shuangliao fault depression are analyzed on the lithological, electric and seismic reflection characteristics. Lithologically, the Huoshiling Formation is composed of tuff, volcanic breccia and sandy conglomerate; Shahezi Formation, composed of gray mudstone, fine sandstone and sandy conglomerate; while the Yingcheng Formation, silty sandstone and sandy conglomerate. The electrical resistivity of Huoshiling Formation shows medium to high value. The Shahezi Formation is characterized by continuous weak reflection or blank reflection. The electrical characteristics of Yingcheng Formation are consistent with the lithologic assemblage. In the seismic profiles, the structural high of Houshiling Formation shows strong reflection. The Shahezi Formation presents chaotic reflection to blank reflection or continuous parallel reflection. The Yingcheng Formation shows continuous strong reflection with low frequency in the top and bottom, while weak blank reflection with low to medium frequency in the middle part.