摘要
本文利用地震速度资料所求得的岩性参数进行地层厚度恢复,求取地层埋藏史,并且结合盆地的现今地温梯度,根据David.A.Wood法(1988)计算不同地层的TTI值和R_o值,确定了万安盆地新生代沉积的生油门限深度,探讨了该盆地中烃源岩的热成熟度史后,指出该盆的生储盖条件良好,古新统至中中新统内的泥岩有利于生烃,砂岩储层多,中新世末形成的局部构造及断层圈闭与油气生成基本同步,有利于成藏。盆地中部的万二坳陷油气勘探前景最佳,万一坳陷(盆地西北部)以油相为主,万三坳陷(盆地东南部)以气相为主。
Presented here are the Cenozoic stratigraphiy, lithology, and their buriel histories of Wan'an basin by seismic velocity analysis and back-strip method, also their TTI and R. values of each stratum are cal- culeted after D. A. Wood's way. Based upon the hydrocarbon generation depth, the maturity history of source rocks, the formation time of local and regional structure, the author point out that the central part(Wan-2 depression) of the basin is the best in oil-gas prospecting; in the northwest part (Wan-1 depression ), oil may be dominent; where as in the southeast part (Wan-3 depression), gas may take precedance.
出处
《南海地质研究》
1994年第6期70-79,共10页
Gresearch of Eological South China Sea
