鄂尔多斯盆地北部姚店油田南区长_6段沉积相特征及其控油规律

Sedimentary facies of Member 6 oil-bearing unit of the Triassic Yanchang Formation and its controlling rule on oil distribution in the Yaodian Oilfield,Ordos Basin

鄂尔多斯盆地北部姚店油田南区长6段主要为灰色、浅灰色细砂岩夹深灰色、灰黑色泥页岩沉积。根据70多口井的单井相分析及数十口井的粒度参数图件分析,姚店油田长6段砂体主要为湖泊三角洲沉积体,发育有三角洲平原和三角洲前缘两大亚相类型和多种微相类型。其中长61油层组发育一条分流河道砂体,长62油层组发育3条分流河道砂体,长63油层组发育2条分流河道砂体。该区沉积相对油水分布具有重要的控制作用,但不是唯一控制因素。

The oil-bearing strata in the Yaodian Oilfield, North, Ordos Basin, belonging to the Upper Triassic Yangchang Formation, are mainly composed of gray and grayish fine sandstones. The analyses of sedimentary facies of 70 wells and the grain-size distribution figures of tens of wells show that the sand bodies of the Chang 6 oil-bearing unit are mainly lacustrine delta deposits,including delta plain and delta front. There is one main stream in Chang 6^1 sand beds,three streams and two streams in Chang 6^2 and Chang 6^3. The sedimentary facies and structure in the study area have significant effects on oil and gas distribution and production.