塔北西部地区肖尔布拉克露头区上寒武统下丘里塔格组沉积特征与模式#br#

doi:10.3969/j.issn.1672-7703.2025.03.008

摘要/Abstract

摘要： 塔北地区上寒武统下丘里塔格组临近北部坳陷和库车坳陷，具双源供烃条件，油气地质条件良好，雄探1井的突破揭示其巨大的勘探潜力。下丘里塔格组缺乏层序格架下的精细沉积特征、沉积微相分布规律和沉积模式研究，制约了下丘里塔格组下一步勘探。通过肖尔布拉克露头区6条剖面共2334.4m地层实测，两个剖面自然伽马曲线和碳同位素曲线实测，555块样品采集并制作岩石薄片进行分析，系统识别了下丘里塔格组地层与层序特征、沉积特征和沉积模式。基于岩性、自然伽马曲线和碳同位素曲线对比明确研究区下丘里塔格组对应台盆区的SQ7和缺失顶部的SQ8；颗粒白云岩、凝块石云岩、叠层石云岩和层纹石云岩为最主要岩石类型；整体为局限台地相，包括5种亚相、6种微相，组合成7种典型沉积序列。受温宿—牙哈古隆起影响，SQ7沉积时期为多种微相频繁旋回变换的潮坪亚相沉积，横向差异较小，建立了由古隆起往盆地方向依次发育潮上带—潮间带—潮下带的沉积模式；SQ8时期由潮坪亚相过渡至台内滩亚相，横向丘体和滩体占比差别较大，建立了古隆起往盆地方向依次发育潮间带—潮下高能带—台内滩的沉积模式。露头区SQ7内部发育61～74个沉积序列，单个沉积序列可构成优质储—盖组合，上百米地层内沉积序列连续发育具备形成叠置连片分布的岩性油气藏潜力；SQ8丘滩体储层广泛发育，具备形成优质构造油气藏的潜力。塔北西部地区受温宿—牙哈古隆起控制丘滩相储层广泛发育且物性好，当上覆为致密岩性且存在通源断裂时，易形成优质油气藏，为勘探有利区。研究成果为塔北地区下丘里塔格组下一步油气勘探提供了方向。

关键词: 塔北地区, 下丘里塔格组, 海相碳酸盐岩, 白云岩, 沉积特征, 沉积模式

Abstract: In Tabei area adjacent to Northern Depression and Kuqa Depression, the Upper Cambrian Lower Qiulitage Formation is characterized by dual hydrocarbon source supply and favorable geological conditions for hydrocarbon accumulation, showing significant exploration potential indicated by breakthroughs in Well Xiongtan 1. However, there is a lack of study on the fine sedimentary characteristics, microfacies distribution pattern, and deposition mode in the sequence framework, which restricts further exploration of Lower Qiulitage Formation. Through field stratigraphic survey of six sections (2334.4 m) in Xiaoerblak outcrop area, GR and carbon isotope curves measurement of two sections, and thin section observation of 555 core samples, the stratigraphy and sequence characteristics, sedimentary characteristics, and deposition modes of Lower Qiulitage Formation are systematically analyzed. The correlation of lithology, GR curve and carbon isotope curve clarifies that Lower Qiulitage Formation in the study area corresponds to SQ7 and SQ8 (absence of the top) in the platform–basin region. The main rock types include granular dolomite, clotted dolomite, stromatolitic dolomite and laminated dolomite. The restricted platform facies was dominant, which was subdivided into five subfacies and six microfacies, forming seven types of typical sedimentary sequences. Influenced by Wensu-Yaha paleo uplift, SQ7 is composed of tidal flat subfacies sediments with frequent cyclic changes of various microfacies and minor lateral variation, and a deposition mode of supratidal zone–intertidal zone–subtidal zone from paleo uplift to the basin has been established. During the deposition period of SQ8, the sedimentary subfacies transitioned from tidal flat to intra-platform beach subfacies, with significant lateral differences in the proportion of mound and beach bodies, and a deposition mode of intertidal zone–subtidal high-energy zone–intra-platform beach from paleo uplift to the basin has been established. A total of 61–74 sedimentary sequences are observed in SQ7 in the outcrop area, with high-quality reservoir–cap rock combination developed in a single sedimentary sequence, and the successive sedimentary sequences in the over-100-meter strata have the potential to form superimposed and connected lithologic oil and gas reservoirs. SQ8 is characterized by widely developed reservoirs and has the potential to form high-quality structural oil and gas reservoirs. Controlled by Wensu–Yaha paleo uplift, the mound beach facies reservoirs are widely distributed in the western Tabei area, with good physical properties. In areas with overlying tight lithology and faults connecting to source rocks, high-quality oil and gas reservoirs were easy to form, showing a favorable area for exploration. The research results provide orientations for further exploration of Lower Qiulitage Formation in Tabei area.

Key words: Tabei area, Lower Qiulitage Formation, marine carbonate rock, dolomite, sedimentary characteristics, deposition mode

中图分类号:

TE122

孙崇浩, 段军茂, 罗新生, 郑剑锋, 石磊, 熊冉, 呼焕, 彭梓俊. 塔北西部地区肖尔布拉克露头区上寒武统下丘里塔格组沉积特征与模式#br#[J]. 中国石油勘探, 2025, 30(3): 109-125.

Sun Chonghao, Duan Junmao, Luo Xinsheng, Zheng Jianfeng, Shi Lei, Xiong Ran, Hu Huan, Peng Zijun. Sedimentary characteristics and deposition modes of the Upper Cambrian Lower Qiulitage Formation in Xiaoerblak outcrop area, western Tabei area[J]. China Petroleum Exploration, 2025, 30(3): 109-125.

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