鄂尔多斯盆地浅水三角洲前缘沉积特征与砂体构型——以宜川仕望河剖面长9油层组为例

doi:10.7657/XJPG20220307

摘要/Abstract

摘要：

三角洲前缘砂体作为油气重要储集体,具有巨大的油气勘探潜力,但目前通过野外露头对浅水三角洲前缘砂体构型的研究较少。以沉积学和储集层构型理论为指导,结合野外露头描述和取样,综合室内分析化验与统计分析的结果,对鄂尔多斯盆地宜川仕望河剖面长9油层组的沉积特征与砂体构型进行分析。研究表明,仕望河剖面长9油层组沉积时期气候温暖潮湿,水体为分层不强的氧化—弱还原过渡的淡水,主要发育浅水三角洲前缘亚相,包括水下分流河道、河口坝、席状砂、分流间湾等微相,长9油层组浅水三角洲前缘单砂体垂向叠置样式包括非连通式和连通式2种,侧向接触样式包括对接式和切叠式2种。地形坡度和湖平面升降共同控制的可容空间增长速率与沉积物供给速率是影响复合砂体空间发育样式的重要因素,缓坡使得河道下切能力相对较弱且具有平面交切的特征,湖平面上升和物源供给减少使可容空间增长速率与沉积物供给速率之比增大,导致砂体连通性减弱,河道—河道切叠和河道—河口坝切叠的砂体构型模式有利于油气聚集成藏。

关键词: 鄂尔多斯盆地, 宜川地区, 仕望河剖面, 长9油层组, 三角洲前缘, 沉积特征, 砂体构型

Abstract:

As an important reservoir for storing oil and gas,the sand bodies in delta front are found with enormous petroleum exploration potential. However,there are few studies on architecture of sand bodies in shallow delta front through field outcrops. Guided by sedimentology and reservoir architecture theories,the outcrop observation and sampling was combined with the results of laboratory experiments and statistical analysis to clarify the sedimentary characteristics and sand body architecture of Chang 9 member in the Shiwanghe section in Yichuan,Ordos basin. The results show that during the deposition,the Chang 9 member in Shiwanghe section lied in a warm and humid environment,especially an oxidation to weak-reduction transitional freshwater environment that was not obviously stratified,and shallow delta front subfacies was mainly developed,including microfacies such as underwater distributary channel,estuary bar,sheet sand and interdistributary bay. The single sand bodies of shallow delta front in Chang 9 member in the study area can be divided into two vertical stacking styles such as non-connected and connected,and two lateral contact styles such as butted and cut-stacked. The accommodation growth rate and sediment supply rate jointly controlled by terrain slope and lake level rise/fall are important factors affecting the spatial development style of the composite sand bodies. The gentle slope allows the channels to incise weakly and present the characteristics of plane intersection. The rise of lake level and the decrease of source supply increase the ratio of accommodation growth rate to sediment supply rate,which may lead to the weakening of sand body connectivity. The architecture models of sand bodies like river-river cut stacking and river-bar cut stacking are favorable for hydrocarbon accumulation.

Key words: Ordos basin, Yichuan area, Siwanghe section, Chang 9 member, delta front, Shiwanghe section, sedimentary characteristic, sand body architecture

中图分类号:

TE112

任奕霖, 赵俊峰, 陈佳宇, 关新, 宋璟淦. 鄂尔多斯盆地浅水三角洲前缘沉积特征与砂体构型——以宜川仕望河剖面长9油层组为例[J]. 新疆石油地质, 2022, 43(3): 310-319.

REN Yilin, ZHAO Junfeng, CHEN Jiayu, GUAN Xin, SONG Jinggan. Sedimentary Characteristics and Sand Body Architecture of Shallow Delta Front in Ordos Basin: A Case Study of Chang 9 Member in Shiwanghe Section in Yichuan[J]. Xinjiang Petroleum Geology, 2022, 43(3): 310-319.

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