塔里木盆地轮台断裂封堵性研究与“雅南I号”构造油气预测

根据轮台断裂的构造特征，提出了应用地球物理方法研究轮台断裂封堵性的技术思路和方法。在地震资料精细保幅处理的基础上，对地震资料进行速度反演，利用地震资料和测井资料计算出断层上、下盘附近地层的泥质含量、泥质涂抹量、孔隙度、地层压力等。通过研究并置接触关系、孔隙连通性、压力差异等判别断裂封堵能力，结合地震资料特殊处理并预测雅南１号构造的含油气性。

STUDIES 0N SEALING EFFECT 0F LUNTAI FAULT AND PETR0LEUM PR0SPECT 0F YANAN N0.1 STRUCTURE,TARIM BASIN

The luntai fault is a large fault at Shaya uplift, Tarim basin, Xinjiang area, northwest China. It extends more than 280km from Bositan at the west to Kuerle at the east in a NEE to nearly EW direction. The fault is spade shaped with inclinations from 22°to 68°to north, steep at upper layers and gentle at deep layers. The fault is a typical large inverse thrust fault cutting many lavers from the Cambrain to the paleogene with maximum vertical fault throw of 4km. The fault is successive and experienced structural movements in different periods. It has controlled the evolution and formation of Yakela—Luntai faulted uplift, and created many oil and gas bearing structures. Many we11s were drilled at the banging side and some industrial standard oil and gas well were found. A few wells were drilled at the lower side but industrial standard oil and gas also found. In order to expand exploration field and investigate possible oil and gas distribution at the lower side of Luntai fault, the authors evaluate the sealing possibility of Luntai fault by using efficient seismic special processing methods and lithological prediction technologies. Based on the analysis of the structural characteristics of Luntai fault, we proposed technical methods for sealing analysis of the fault with geophysical methods. The methods are 1) seismic velocity inversion after carefu1 true amplitude seismic data processing; 2) calculation of the amount and distribution of clay, clay smears, porosity, pressure at both sides of the fault with seismic data and log data; 3) predicting sealing ability by comprehensive analysis of the relation of juxtaposition, permeability, c1ay sri1car potential, pressure difference: 4) evaluating oil and gas bearing possibility in Yanan No.1 structure on the data of seismic special processing and lithological predication.