鄯善-丘陵交界区域三间房组沉积相特征
Sedimentary facies in the Sanjianfang Formation along the Shanshan-Qiuling boundary in Xinjiang
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摘要: 通过对鄯善-丘陵交界区域110口井的录井、测井及分析化验资料的综合分析,认为三间房组发育辫状河三角洲及湖相沉积。共识别出两种相、3种亚相、8种微相。三间房组沉积早期(第5砂组-第3砂组),形成了一套进积-退积的沉积序列;伴随着湖平面下降,辫状河三角洲前缘及湖泊沉积逐渐减少,平原沉积逐渐增加,至第4砂组第1小层(S41)沉积时期,全区均为平原沉积;之后湖平面逐渐上升,辫状河三角洲平原沉积减少、前缘沉积增加;物源主要来自南部。三间房组晚期沉积(第2砂组-第1砂组)为一套进积序列,由辫状河三角洲前缘沉积逐渐演变为平原沉积,研究区除了受来自南东-南部物源的影响外,也有来自北方的沉积物源供给。Abstract: In the light of well logs and associated data, the Sanjianfang Formation along the Shanshan-Qiuling boundary in Xinjiang is believed to be made up of the braided delta and lacustrine deposits, especially the braided delta plain and front subfacies, which may be subdivided into 8 sedimentary microfacies. The Sanjianfang Formation has undergone several stages of evolution:progradational-regradational depositional sequences during the early stage, braided delta plain deposits during the middle stage, and braided delta front deposits during the later stage of the deposition of the Sanjianfang Formation. The detritus are mostly derived from the southeastern and southern parts, and locally from the northern part of the basin.
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