苏里格地区转换波初至识别方法研究

P-SV转换波静校正是转换波处理中的一个难题，常规的纵波静校正方法不能用于转换波处理。利用初至波进行纵波静校正取得了很好的效果，但是由于转换波初至识别和拾取困难，针对转换波的折射静校正方法一直没有得到较好的应用。对转换波初至的组成和特点进行了讨论，通过推导共检波点道集中初至的时距曲线得到了共检波点道集中P-P-P波初至和P-P-SV波初至在一定偏移据范围内平行的结论。根据这一结论，提出了共检波点域初至波叠加法确定转换波初至的算法，并对苏里格地区的转换波资料进行了转换波初至识别，取得了满意的效果。

LIANGGAOSHAN FORMATION RESERVOIR CHARACTERISTICS OF NANCHONG STRUCTURE，CENTRAL SICHUAN BASIN

The baisc features such as the types of accumulative spaces，the distribution in vertical direction，and the main controlling factors and diagenesis are probed in detail and the favorable reservoir distribution is predicted based on core analysis data，conventional physical property data and well log information of Jurassic Lianggaoshan Formation，central Sichuan Basin.Research indicates the reservoirs are mainly distriduted in Lianggaoshan I and Ⅱsections of upper Lianggaoshan Formation.The thickness of sandbodies is uneven and goes thinner laterally from east to west.The sandbodies are the ones of sand bars and sand beach when lacustrine facies deposited.The prosity and permeability of the reservoirs are generally low with well developed fractures，the reservoirs are ultra-low prosity and tight ones.The sand reservoirs of Lianggaoshan formation are dominated by pore-fracture types with locally existing fracture-pore type.