苏北盆地金湖凹陷碳酸盐岩沉积特征及演化模式

doi:10.7623/syxb201304010

石油学报 ›› 2013, Vol. 34 ›› Issue (4): 701-711.DOI: 10.7623/syxb201304010

苏北盆地金湖凹陷碳酸盐岩沉积特征及演化模式

邵先杰¹, 王彩凤¹, 黄伟², 钟思瑛², 刘金华², 廖光明², 陈军²

1. 燕山大学石油工程系河北秦皇岛 066004;
2. 中国石化江苏油田分公司江苏扬州 225012

收稿日期:2013-01-30 修回日期:2013-04-14 出版日期:2013-07-25 发布日期:2013-07-04
通讯作者: 邵先杰
作者简介:邵先杰,男,1964年2月生,1988年获中国地质大学(武汉)学士学位,2004年获中国地质大学(北京)博士学位,现为燕山大学石油工程系教授,主要从事油藏描述、油气田开发、煤层气工程方面的教学与科研工作。Email:shaoxianjie6@qq.com
基金资助:
国家重大科技专项 (2011ZX05038)资助。

Sedimentary characteristics and evolutionary patterns of carbonates in Jinhu depression, Subei Basin

SHAO Xianjie¹, WANG Caifeng¹, HUANG Wei², ZHONG Siying², LIU Jinhua², LIAO Guangming², CHEN Jun²

1. Department of Petroleum Engineering, Yanshan University, Qinhuangdao 066004, China;
2. Sinopec Jiangsu Oilfield Company, Yangzhou 225012, China

Received:2013-01-30 Revised:2013-04-14 Online:2013-07-25 Published:2013-07-04

摘要/Abstract

摘要：

根据对大量薄片和岩心的观察,金湖凹陷西斜坡碳酸盐岩的颗粒类型主要有生物碎屑、鲕粒、球粒、藻叠层石和陆源砂。生物碎屑含量丰富,以蠕虫动物中的环节动物门龙介虫科(Serpulidae)含量最高,占生物碎屑颗粒的70% 以上,其他也见藻类、介形虫、腕足、腹足、硅藻、有孔虫、苔藓等化石。生物数量虽然比较多,但种属单调,耐盐度比较窄,为半咸水海洋生物组合。微量元素硼的质量分数平均为77.6×10^-6,硼与镓的比值(B/Ga)平均为3.6,也显示为半咸水环境。结合沉积物特征、生物组合和特殊矿物分析,认为金湖凹陷在古新统阜宁组二段第Ⅱ油组(E₁f₂²)沉积时期,发生了海侵或与海洋有通道沟通、具有半咸水潟湖环境特征。水体清澈,构造活动相对平静,湖盆沉降和沉积速率缓慢且补偿适中,因此在西斜坡沉积了一套厚度为10~20 m、分布广阔的碳酸盐岩。根据颗粒类型和沉积特征,划分出4种沉积相带,包括陆源碎屑-碳酸盐混合相、鲕粒滩相、生物碎屑滩相、泥晶灰岩相,各相带在纵向和横向出现有规律的交替分布。生物碎屑灰岩溶孔发育,含油气丰富,已作为产能接替区投入了开发,并取得了一定效果。

关键词: 碳酸盐岩, 鲕粒, 生物碎屑灰岩, 演化模式, 金湖凹陷

Abstract:

Based on observations of a large number of cast thin sections and rock cores, grain types of carbonates in the west slope of the Jinhu depression were identified to be mainly composed of bioclast, oolite, spherulite, algal stromatolite and arenite. Of which bioclast is abundant and predominated by Annelida Serpulidae of vermes, which account for over 70 percent of the bioclast. And the other bioclast consists of algal, ostracod, brachiopod, gastropod, diatom, foraminifera and moss fossils. Although the amount of organisms is large, their species, composed mainly of brackish halobios, are relatively monotonous with narrower salt tolerance. The mass fraction of boron in microelements averages 77.6×10^-6 and the ratio of boron to gallium averages 3.6, indicating a brackish environment. The combination of sedimentary characteristics with analyses of organism assemblages and special minerals indicated a feature of a brackish lagoon environment as well, suggesting transgression or channels connecting with ocean during the deposition of the E₁f₂² interval in the Jinhu depression. At that time, a suite of carbonates with 10~20 m in thickness was deposited widely in the west slope, indicating clear waters, relatively tranquil tectonic activities, slow lake-basin subsidence and deposition rate, and moderate compensation. Based on grain types and depositional characteristics, this suite of carbonates can be classified into four different sedimentary microfacies, i.e. mixed facies of terrigenous clastics and carbonates, oolite beach facies, bioclastic beach facies and cryptite facies. Vertically and horizontally each facies appears alternately. Dissolved pores are well-developed in bioclastic limestones which contain plenty of hydrocarbons. These carbonate reservoirs have been developed as a block of production succession in the Jinhu depression and certain deliverability has been obtained.

Key words: carbonate, oolite, bioclastic limestone, evolutionary pattern, Jinhu depression

中图分类号:

TE112.2

邵先杰, 王彩凤, 黄伟, 钟思瑛, 刘金华, 廖光明, 陈军. 苏北盆地金湖凹陷碳酸盐岩沉积特征及演化模式[J]. 石油学报, 2013, 34(4): 701-711.

SHAO Xianjie, WANG Caifeng, HUANG Wei, ZHONG Siying, LIU Jinhua, LIAO Guangming, CHEN Jun. Sedimentary characteristics and evolutionary patterns of carbonates in Jinhu depression, Subei Basin[J]. Editorial office of ACTA PETROLEI SINICA, 2013, 34(4): 701-711.

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苏北盆地金湖凹陷碳酸盐岩沉积特征及演化模式

Sedimentary characteristics and evolutionary patterns of carbonates in Jinhu depression, Subei Basin

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