天然气地球科学

• 天然气地质学 • 上一篇    下一篇

塔里木盆地中下寒武统白云岩储层分布特征及勘探意义

田雷,崔海峰,陈永权,刘军,张年春   

  1. (1.中国石油勘探开发研究院西北分院,甘肃 兰州 730020;
    2.中国石油塔里木油田分公司石油勘探开发研究院,新疆 库尔勒 841000)
  • 收稿日期:2015-05-20 修回日期:2015-09-14 出版日期:2015-09-20 发布日期:2015-09-20
  • 作者简介:田雷(1982-),男,湖北荆州人,工程师,硕士,主要从事沉积储层及石油地质研究. E-mail:tianlei_xds@petrochina.com.cn.
  • 基金资助:

    中国石油天然气股份有限公司科学研究与技术开发项目(编号:090106-4)资助.

The Distribution Characteristics and Prospecting Significance of the Middle and Lower Cambrian Dolomite Reservoir in Tarim Basin

TIAN Lei,CUI Hai-feng,CHEN Yong-quan,LIU Jun,ZHANG Nian-chun   

  1. (1.Researh Institute of Petroleum Exploration and Development-Northwest,PetroChina,Lanzhou 730020,china;
    2.Research Institute of Exploration & Development,Tarim Oilfield Company,PetroChina,Korla 841000,China)
  • Received:2015-05-20 Revised:2015-09-14 Online:2015-09-20 Published:2015-09-20

摘要:

塔里木盆地中下寒武统白云岩储集空间类型有膏溶孔、粒内孔、粒间孔、晶间溶孔和构造裂缝。根据储集空间类型特征,白云岩储层可划分为膏溶孔型和颗粒+晶间溶孔型2种类型。利用岩心与常规测井资料进行高频层序与储层对比分析,结果表明中寒武统储层主要类型为膏溶孔型,储层发育受控于膏云坪沉积微相和同沉积期向上变浅的米级旋回;下寒武统储层主要类型为颗粒+晶间溶孔型,储层发育受控于潮下高能滩沉积微相和沉积期后三级层序界面的暴露淋滤,横向上表现为准层状分布特征。利用地层厚度、地震相等作图方法,初步预测了中寒武统膏云坪和下寒武统高能滩沉积相带的展布。中寒武统膏云坪微相在塔北—塔中地区沿着牙哈—塔中东部呈SN向带状分布,在塔西南地区沿着塘古孜巴斯凹陷东部到和田凹陷呈SWW向带状分布;下寒武统高能滩主要发育在由早加里东期张性同沉积断裂控制的水下隆起地貌,在塔中、巴楚隆起以及麦盖提斜坡广泛分布。结合储层分布特征与油气成藏条件分析,认为塔中寒武统膏溶孔型白云岩储层仍有较大的勘探潜力,盖层条件是成藏的关键;下寒武统白云岩储层分布面积广,勘探潜力大,是深层碳酸盐岩重要的油气勘探目标,巴楚隆起及其围斜部位是下寒武统白云岩的有利勘探区带。

关键词: 塔里木盆地, 中下寒武统, 白云岩, 膏云坪, 高能滩, 储层分布

Abstract:

The space of the Middle and Lower Cambrian dolomite reservoir is mainly composed of paste solution pores,dissolved inter-grain pores,dissolved intra-grain pores,inter-crystal pores,inter-crystal dissolved pores and cracks.According to the characters of reservoir space types,dolomite reservoir can be divided into paste solution pores style and carbonate grains-inter-crystal pores.The high frequency sequence and reservoir correlation of Middle and Lower Cambrian dolomite were analyzed by use of core and conventional log data.The results prove that the middle dolomite reservoir is mainly paste solution pores style,and the development of reservoir was controlled by gypsum-bearing dolomite flat micro-sedimentary faces and meter-scale cyclic sequences.The Lower Cambrian dolomite reservoir is mainly carbonate grains-inter-crystal pores,and the development of reservoir were controlled by high-energy beach micro-sedimentary faces and the exposure of the sequence interface leaching.Though drawing methods which are bed thickness and seismic facies,the distribution of gypsum-bearing dolomite flat micro-sedimentary faces and high-energy beach micro-sedimentary faces are preliminary forecasted.The gypsum-bearing dolomite flat micro-sedimentary faces of Middle Cambrian is distributed along the line of well Yaha10 and Zhongshen1 in the northern and central Tarim and line of Tangguzibasi Sag and Hetian Sag in the southwestern Tarim Basin;the high-energy beach micro-sedimentary faces of Lower Cambrian is developed in the underwater uplift terrain which is controlled by the Early Caledonian period normal fault,which is widely distributed in Tazhong,Bachu and Maigaiti slope.Combined with analysis of distribution Characteristics and petroleum accumulation condition,it is considered that Middle Cambrian dolomite reservoir in Yaha-Donghetang and eastern Tazhong area still have exploration potential,cap rock and preservation condition are key to the hydrocarbon accumulation.The widely distributed dolomite reservoir of Lower Cambrian have large prospecting potential,which are the important exploration targets of deep carbonatite,Bachu high and its ramp are the main favorable areas for the salt-capped Cambrian exploration.

Key words: Tarim Basin, Middle and Lower Cambrian, Dolomite, Gypsum-bearing dolomite flat, High-energy beach, Reservoir distribution

中图分类号: 

  • TE122

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