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渤海盆地JZ油田沙河街组白云岩成因分析

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颜冠山, 刘宗宾, 宋洪亮, 韩雪芳, 张振杰, 程大勇. 渤海盆地JZ油田沙河街组白云岩成因分析[J]. 海洋地质前沿, 2020, 36(6): 26-35. doi: 10.16028/j.1009-2722.2019.158
引用本文: 颜冠山, 刘宗宾, 宋洪亮, 韩雪芳, 张振杰, 程大勇. 渤海盆地JZ油田沙河街组白云岩成因分析[J]. 海洋地质前沿, 2020, 36(6): 26-35. doi: 10.16028/j.1009-2722.2019.158
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YAN Guanshan, LIU Zongbin, SONG Hongliang, HAN Xuefang, ZHANG Zhenjie, CHENG Dayong. GENESIS OF THE DOLOMITE IN THE SHAHEJIE FORMATION OF JZ OILFIELD, BOHAI BASIN[J]. Marine Geology Frontiers, 2020, 36(6): 26-35. doi: 10.16028/j.1009-2722.2019.158
Citation: YAN Guanshan, LIU Zongbin, SONG Hongliang, HAN Xuefang, ZHANG Zhenjie, CHENG Dayong. GENESIS OF THE DOLOMITE IN THE SHAHEJIE FORMATION OF JZ OILFIELD, BOHAI BASIN[J]. Marine Geology Frontiers, 2020, 36(6): 26-35. doi: 10.16028/j.1009-2722.2019.158
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渤海盆地JZ油田沙河街组白云岩成因分析

  • 中海石油(中国)有限公司天津分公司渤海石油研究院，天津 300459

  • 基金项目:
    “十三五”国家科技重大专项“渤海重点地区古近系优质储层评价与成藏分析技术”(2016ZX05024-003-005)
详细信息
    作者简介: 颜冠山(1989—)，男，硕士，工程师，现主要从事沉积学和储层评价研究工作. E-mail：yangsh6@cnooc.com.cn

  • 中图分类号: P618.13; P736

GENESIS OF THE DOLOMITE IN THE SHAHEJIE FORMATION OF JZ OILFIELD, BOHAI BASIN

  • Bohai Oilfield Research Institute, Tianjin Branch of CNOOC Ltd., Tianjin 300459, China

    摘要

  • 研究区以生屑白云岩及含砂屑的鲕粒白云岩为主，相邻井区白云岩类型及厚度变化大。为确定各类白云岩的成因，通过孢粉及微体古生物化石、碳氧同位素、微量元素B含量等分析手段，对本区的古气候、古环境、古沉积介质的物理化学性质进行系统地分析，自沙三段以来，由温暖的亚热带气候变得逐渐干燥，水体逐渐咸化，为白云岩的形成提供了必要条件。具有硬的基底的滨浅湖台地，水体能长期保持清澈，有利于底栖生物生长繁殖，适宜碳酸盐岩的形成、沉积了巨厚的生屑白云岩，其生屑含量高、孔隙较发育、方解石也被交代的更加彻底，建立了该类白云岩滨浅湖台地渗透回流成因模式。滨浅湖隆起带区域，淡水与咸水在此交汇，易形成具雾心亮边的粉晶白云岩和具有同心圆结构的鲕粒云岩或生物碎屑云岩，但常常白云石化不彻底，方解石含量高，个别井段甚至发育云质鲕粒灰岩，建立了该类白云岩滨浅湖隆起带混合水成因模式。此研究丰富了湖相白云岩成因模式，对渤海湾盆地碳酸盐岩的勘探具有重要的指导意义。

    Bioclastic dolomite and sand-bearing oolitic dolomite are widely distributed in the study area. Drilling shows that the lithology and thickness of dolomite vary greatly from well to well. In order to reveal the genesis of the dolomite, the physical and chemical properties of the depositional media, paleoclimate and paleoenvironment of the area are systematically studied by means of sporopollen and micro paleontology, carbon and oxygen isotopes and trace element B. It is found that since the 3rd Member of the Shahejie Formation, warm subtropical climate had gradually turned to dry, and the water body become salty, which provided basic conditions for the dolomite to form. On the nearshore and shallow lake platform with hard basement, however, water was clean, which was in favor of the growth and reproduction of benthic organisms and the formation of limestone and bioclastic dolomite with huge thickness. As the bioclastic content is high, pores are well developed, and the calcite is also more thoroughly replaced by dolomite. Upon the basis, a seepage reflux model for such kind of dolomite platform is established by the authors. In the uplifting zone of the nearshore and shallow parts of the lake, where fresh and saline water mixed, it is easy to form the silty dolomite with sparry edge and cloudy nucleus and the oolitic dolomite or bioclastic dolomite with concentric structure. However, dolomitization is often incomplete, calcite content is high sometimes, and therefore dolomitic oolitic limestone is common in some wells. For these dolomitic deposits, a genetic model of mixed water is proposed specially for nearshore-shallow lake uplift zones. The genetic models of lacustrine dolomite are of important significance for hydrocarbon exploration in carbonate rocks in Bohai Bay Basin.

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  • 图 1  JZ油田区域位置图

    Figure 1. 

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    图 2  JZ油田沙河街组地层对比

    Figure 2. 

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    图 3  JZ油田沙河街组生屑白云岩特征

    Figure 3. 

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    图 4  JZ1井沙河街组B元素含量变化

    Figure 4. 

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    图 5  JZ油田沙河街组白云岩成因模式

    Figure 5. 

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    表 1  辽东湾坳陷辽西低凸起地区沙河街组碳酸盐岩碳、氧同位素分析数据

    Table 1.  Carbon and oxygen isotopic data of the Shahejie Formation carbonate rocks in Liaoxi low uplift area of Liaodongwan Depression

    样品号 岩性 井深/
    m    		 层位 δ13CPDB/
    ‰    		 δ18OPDB/
    ‰    		 古盐度
    指数Z    		 古温度
    T/℃    		 古盐度
    S/‰
    1 陆屑白云岩 2 234.3 E2s3 12.26 -12.66 146.10 93.83 14.00
    2 生屑白云岩 1 877.35 E2s1 3.86 -15.58 127.45 116.24 9.21
    3 生屑白云岩 1 639.68 E3s1 6.1 -14.5 132.57 107.77 10.98
    4 生屑白云岩 2 047.2 E3s1 2.37 -13.1 125.63 97.17 13.28
    5 生屑白云岩 2 341.0 E3s2 1.02 -4.89 126.95 43.25 26.74
    6 陆屑灰岩 2 224.7 E3s2 8.35 -10.53 139.16 78.70 17.49
    注:古盐度指数Z=2.048×(δ13CPDB+50)+0.498×(δ18OPDB+50)；古盐度S=(δ18OPDB+21.2)/0.61；古温度T=16.9-4.38×(δC-δw)+0.10×(δC-δw)2，其中δC=41.2，δw=40.93+1.04093×δ18OPDB。
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收稿日期:  2019-07-12
刊出日期:  2020-06-28

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