镰刀湾探区延长组长2油层组沉积体系特征分析

ANALYSIS ON RIVER DEPOSITIONAL SYSTEM OF CHANG 2 OF YANCHANG FORMATION IN LANDAOWAN EXPLORATION AREA

通过对镰刀湾探区100余口井的岩心观察及对镰106井、化3井、化45-28井等的重点分析,结合岩电特征、沉积模式等图谱资料的对比研究,对镰刀湾探区延长组长2油层组河流沉积体系的特征进行了深入研究.依据砂体的几何形态、相序特征和相变关系以及河道的平面形态,可以分为辫状河、曲河流及交织河3个亚相,其突出特征与主要的沉积场所是河道.镰刀湾地区长2油层组主要为河流相沉积,其中长23以辫状河沉积为主,长22以曲流河沉积为主,长21大部分为交织河.

Coring from many wells in the region of interest in Liandaowan exploration area have been observed,data from Lian 106 Well,hua 3 Well,Hua 45-28 Well and data from logging.Detail study on river depositional microfacies of chang 2 of Yanchang formation in Liandaowan exploration area.Based on sand body geometric shape,sequence features and phase transformation relation and the river plane form,can be divided into braided river,curve river and intertwined river,its outstanding characteristic and main sedimentary place is river.The reservoir group of chang 2 of Yanchang formation is mianly forming from river deposition,chang 2 is mianly form braided river deposition,and chang 2 is mianly form curve riverdeposition,most of chang 2 forming from intertwined riverdeposition.