川西坳陷孝泉-新场-合兴场地区须家河组发育大套优质烃源岩．通过一系列有机地球化学分析方法对其各个层段的有机质丰度、有机质类型和有机质成熟度进行了研究对比，认为该区须家河组烃源岩除小塘子-马鞍塘组和须三、须五段主要的烃源岩段较为发育外，须二、须四段也发育相对较好的烃源岩，这些储层段中发育的烃源岩构成了成藏子系统发育的基础；烃源岩有机质丰度高，有机质类型主要为Ⅲ型、部分为Ⅱ，型，有机质成熟度高，且随深度增大各项反映成熟度的指标值均逐渐增大；有机碳含量和成熟度的平面分布除丰谷地区须三段相对最高外，其他层段均表现为西高东低的特征。%The Xujiahe formation of Xiaoquan- Xinchang- Hexingchang regionin western Sichuan depression development large fine hydrocarbon source rocks based on the study and comparison of the source rocks about organic abundance, organic type and degree of organic maturity. Besides the Maantang - Xiaotangzi formation, the third member of Xujiahe and the fifth member of Xujiahe are the most important source rocks, the second and fourth member of Xujiahe formation also development the good quantity source rocks. That are the basic for sub system of play in the reservoir ; the organic abundance is high, Organic matter is mainly dominated by type Ⅲ ker- ogen and part by type Ⅱ 2, the degree of organic maturity is also high and the index of maturity increases as the depth increases. Besides the third member of Xujiahe has the highest data relatively, the organic carbon content and degree of organic maturity in plane all represent the same characteristic in other formation, which is higher in the west and lower in the east.
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