本文利用测井、钻井和C、O同位素等资料，研究了核二段各砂组沉积时期的沉积环境、相带分布、砂体展布以及沉积演化规律。
Sedimentary environment and its evolution, distribution of sedimentary facies and sand bodies are discussed on the base of the data of log, drilling and c, o isotope.
嫩一段和嫩二段主要发育滨—浅湖和半深—深湖沉积，零星分布薄层砂滩砂体。
The shore-shallow lake and hemi-deep-deep lake develop in the first and second member of Nenjiang formation, and thin bed beach sands distribute fragmentarily.
合川地区须二段处于滨浅湖亚相环境，滨浅湖滩坝砂体是该区主要的储集砂体。
The sedimentary environment of the 2nd member of the Xujiahe Fomation is shore-shallow lacustrine. The reservoir sand is beach bar.
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