延川南气田二叠系储层砂体形态研究
A Research of Reservoir Sand Body Morphology in Permian System of the Yanchuannan Gas Field

储层砂体的研究是井位部署的基础和依据。延川南气田二叠系山西组—盒8段发育三角洲平原沉积，主要包括分支河道、决口扇、沼泽等微相；盒7段以上发育曲流河沉积，主要包括河床、堤岸、河漫亚相。识别出三角洲平原分支河道砂体、决口扇砂体，曲流河河道砂体、堤岸–河漫砂体等4种储层砂体，通过砂体物性研究认为河道砂体、分支河道砂体是研究区二叠系的有效储层，并分析其剖面、平面展布特征。以此为依据进行布井、调层，在生产上取得了测试高产。
The research of reservoir sand is the basic for well deployment. Delta plain deposits are developed in the He 8 Member of Shanxi group of Permian in South Yanchuan Coalbed Methane Field, including distributary channels, crevasse splays and swamp. Meandering river deposits are developed above the He 7 Member, including riverbed, bank, and fluvial flood deposit. 4 reservoir sands—the branch channel, crevasse splay, riverbed and bank-overbank sand are recognized. By the research of sand physical property, the branch channel and riverbed sand are considered to be the effective reservoir in Permian System of the study area; the profile and plane distribution features have been analyzed. This research was used in well spacing and layer-adjusting, which achieved high yield on test.