岩性油气藏 ›› 2021, Vol. 33 ›› Issue (5): 70–80.doi: 10.12108/yxyqc.20210507

• 油气地质 • 上一篇    下一篇

河控浅水三角洲前缘沉积特征及对岩性油藏的控制——以库车坳陷南斜坡巴西改组为例

罗浩渝1, 陈军2, 章学岐1, 孟祥霞2, 赵凤全1, 吴少军1, 郭璇2   

  1. 1. 中国石油塔里木油田分公司 勘探开发研究院, 新疆 库尔勒 841000;
    2. 中国石油勘探开发研究院 西北分院, 兰州 730020
  • 收稿日期:2021-01-25 修回日期:2021-03-18 出版日期:2021-10-01 发布日期:2021-09-30
  • 通讯作者: 陈军(1982-),男,硕士,高级工程师,主要从事石油地质及构造解释工作。Email:chenjun_xds@petrochina.com.cn。 E-mail:chenjun_xds@petrochina.com.cn
  • 作者简介:罗浩渝(1985-),男,工程师,主要从事石油地质研究工作。地址:(841000)新疆库尔勒市石化大道26号勘探开发研究院。Email:luohh-tlm@petrochina.com.cn
  • 基金资助:
    国家科技重大专项“塔里木盆地盐下超深层油气分布规律及有利勘探区带评价”（编号：2019YFC0605505）和“塔中、库车地区深层—超深层油气成藏过程及有利勘探目标”（编号：2017ZX05008-004-001）联合资助

Sedimentary characteristics of fluvial dominated shallow water delta front and its control on lithologic reservoir: A case study of Baxigai Formation in south slope of Kuqa Depression

LUO Haoyu1, CHEN Jun2, ZHANG Xueqi1, MENG Xiangxia2, ZHAO Fengquan1, WU Shaojun1, GUO Xuan2   

  1. 1. Research Institute of Exploration and Development, PetroChina Tarim Oilfield Company, Korla 841000, Xinjiang, China;
    2. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China
  • Received:2021-01-25 Revised:2021-03-18 Online:2021-10-01 Published:2021-09-30

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摘要： 库车坳陷南斜坡白垩系巴西改组已发现2个岩性油气藏，展现出了该地区白垩系岩性油气藏勘探的潜力。为了进一步拓展白垩系巴西改组岩性勘探领域，通过岩心观察、测井相、地震相、砂地比和古地貌等综合分析，明确巴西改组上、中、下3段的物源均来自东南方向的哈拉哈塘南部和英买力南部，沉积体系为河控浅水三角洲。巴西改组中、下段分布在哈拉哈塘东南部，发育河控浅水三角洲内前缘-浅湖亚相，上段在研究区均有分布，为退积型沉积，发育河控浅水三角洲内前缘-外前缘-浅湖亚相。研究区白垩系的构造为南高北低，在南部物源的空间匹配关系下，认为退积型河控浅水三角洲内前缘顶部的席状砂，外前缘侧翼的水下分流河道和外前缘倾末端的席状砂是岩性油气藏勘探的有利相带。巴西改组上段是岩性勘探的首选目的层，英买力南部和yd7-ym46-dh26井环带是其有利地区。该成果可为库车坳陷南斜坡白垩系巴西改组下一步岩性油藏的勘探提供依据。

关键词: 河控浅水三角洲, 水下分流河道, 巴西改组, 白垩系, 岩性油气藏, 库车坳陷

Abstract: Two lithologic reservoirs have been discovered in south slope of Kuqa Depression, which shows the great potential of Cretaceous lithologic reservoirs exploration in this area. To further expand the field of lithologic reservoir exploration in Cretaceous Baxigai Formation, based on core observation, well logging facies, seismic facies, ratio of the sand and formation and paleogeomorphology, it is confirmed that the provenance of member U, M and L are from south Halahatang and south Yingmaili. The sedimentary system is fluvial dominated shallow water delta. The member M and L of Baxigai Formation are distributed in the southeast Halahatang, and inner front shallow lacstrine subfacies of fluvial dominated shallow water delta are developed. The member U are distributed in the project, which is a retrograde depositional model, inner front-outer front-shallow lacstrine facies of fluvial dominated shallow water delta are developed. The structure of the project is dip northward, and the provenance comes from the south. The sheet sand at the top of the inner front, the underwater distributary channel on the flank of the outer front and the sheet sand at the tip of the outer front are the favorable facies for lithologic reservoir exploration. The south Yingmaili and well annulus of yd7-ym46-dh26 are prospects for Cretaceous lithologic reservoirs exploration in member U of Baxigai Formation. The results can provide a basis for further exploration of Cretaceous lithologic reservoirs in south slope of Kuqa Depression.

Key words: fluvial dominated shallow water delta, underwater distributary channel, Baxigai Formation, Cretaceous, lithologic reservoir, Kuqa Depression

中图分类号: 

  • TE121.3
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