西部S盆地T凹陷J3组地震相分析

通过对西部Ｓ盆地Ｔ凹陷的剖面地震相分析，并根据内部反射结构和外部几何形态，将该凹分为席状反射相，席状披覆反射相，楔状发散反射相，空白反射相，叠瓦状反射相，杂乱反射相，叠瓦状反射相和前积反相等，并绘制了Ｊ３组地震相平面分布图。

Seismic Facies Analysis of Group J3 in T Depression of S Basin in the Western China

According to the seismic .factes analysis of the T sag, seven types of seismic factes are given based on the internal seismic reflection structure and external geometric configuration, including sheet reflection factes, sheet drape factes, wedged factes, blank factes, shingled reflection factes, chaotic reflection factes and progradational reflection factes. Based on these factes, typical seismic factes of the strata in group J3 are analyzed, such as wedged reflection factes, shingled reflection factes, chaotic and progradational reflection factes. The area distribution map of the seismic factes in J3 is constructed. It is pointed out that the wide-spread coal bed and dark carbonaceous shaleare the main hydrocarbon source rocks, that the distributary channel sand and the point bar of the delta plain and front boundary are the most favorable reservoir body.