中文摘要：

充分利用印度扇深水区及浅水陆棚区地震、测井、岩芯、地化等资料,预测了印度扇深水区古—始新统烃源岩特征,并探讨了烃源岩的发育模式。研究结果表明：印度扇深水区古—始统地层主要以海进体系域为主,在始新统顶部发育厚度较薄的高位体系域,沉积于外陆棚深水相沉积环境,具备烃源岩发育的有利条件。古—始新统烃源岩空间分布范围广,厚度大,最大厚度达900 m以上。烃源岩有机质类型以Ⅱ~Ⅲ型干酪根为主,为混合型生源母质。现今凹陷内大部分烃源岩处于高—过成熟的生干气阶段。综合各地质要素分析,建立了印度扇深水区古—始新统烃源岩发育模式。在古—始新世沉积期,深水凹陷的古地理格局总体变化不大,处于赤道附近的低纬度地带,气候湿热。在有利的有机质保存条件下,古海洋生产力和陆源有机质输入量控制了深水区古—始新统烃源岩的有机质丰度。研究结果将有效指导印度扇深水区的油气勘探工作。

英文摘要：

Based upon the data on seismic,well logging,core and geochemistry in Indus fan deepwater area and shallow shelf,we predict the development characteristics of Paleocene and Eocene source rocks of the Indus fan deepwater area,and discuss the depositional models of source rocks. The results show that Paleocene and Eocene source rocks has the most favorable conditions for development of high-quality hydrocarbon source rocks as it mainly developed transgressive system tracts and thinner thickness highstand system tract in Upper Eocene,deposited in a deepwater outershelf environment. Paleocene and Eocene source rocks are characterized by extensive distribution,large thickness with the maximum thickness of 900 m. The organic material forms of source rocks are type II-III,which are mixed organic matter. By the comprehensive analysis of various geological features,the distribution and model of source rocks has been reconstructed in the Indus Fan deepwater area. During the sedimentary period of the Paleocene and Eocene,the paleogeographic characteristics show narrow variation,which located in the low latitude belt near the equator,indicating warm and moist climate. As a good organic preservation condition was provided,the abundance of organic matter of Paleocene and Eocene source rocks is mainly controlled by the paleo-productivity and the organic matter flux to the sag. The research results will offer convenient service for oil and gas exploration in Indus Fan deepwater area.