渤海海域秦皇岛29-2东构造优质混积储层主控因素
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  • 英文篇名:The Controlling Factors of the High-quality Mixed Reservoirs in QHD29-2E Structure,Bohai Sea
  • 作者:张藜 ; 王德英 ; 张新涛 ; 刘艺萌 ; 徐伟
  • 英文作者:ZHANG Li;WANG De Ying;ZHANG XinTao;LIU YiMeng;XU Wei;Tianjin Branch of CNOOC Ltd.;
  • 关键词:混积储层 ; 主控因素 ; 秦皇岛29-2东构造 ; 渤海
  • 英文关键词:mixed reservoirs;;controlling factors;;QHD29-2E structure;;Bohai Sea
  • 中文刊名:CJXB
  • 英文刊名:Acta Sedimentologica Sinica
  • 机构:中海石油(中国)有限公司天津分公司;
  • 出版日期:2018-04-12 16:09
  • 出版单位:沉积学报
  • 年:2019
  • 期:v.37
  • 基金:国家科技重大专项(2016ZX05024-003)~~
  • 语种:中文;
  • 页:CJXB201901020
  • 页数:12
  • CN:01
  • ISSN:62-1038/P
  • 分类号:203-214
摘要
中深层优质储层的发育通常制约着油气的富集程度。渤海海域秦皇岛29-2东构造钻遇物性极好的陆源碎屑和碳酸盐鲕粒、生物碎屑混积储层,对其控制因素开展研究对类似地区具有启示意义。通过岩芯观察、薄片、扫描电镜、电子探针、物性、全岩、同位素及流体包裹体等分析,系统阐述了秦皇岛29-2东混积岩的岩石学和储集空间等特征,研究结果显示:研究区沙一二段混合沉积储集层包括含陆源碎屑—碳酸盐混积岩、陆源碎屑质碳酸盐混积岩和碳酸盐质—陆源碎屑岩3类,储层类型为高孔、低—特低渗型;孔隙主要为粒间孔、生物体腔孔和次生溶蚀孔隙。并讨论了混积岩优质储层的形成机制,认为咸化湖盆滨浅湖强湖浪作用下形成的富螺混积滩相、埋藏成岩早期白云石化和成岩中后期溶蚀作用是控制该优质储层形成的重要因素。
        The development of the high-quality reservoir in medium-deep sections often decides hydrocarbon enrichment. The depth of medium-deep sections in the Bohai sea is approximately greater than 3 000 m with poor reservoir physical properties. We found a mixed reservoir,including terrigenous detrital and Carbonate oolitics and bioclasts,with excellent physical properties in the 1~(st) and 2~(nd) member of the Shahejie Formation( E_3s_(1+2)) in the QHD29-2E structure,and the research of the controlling factors,which have significant implications for similar areas. The features of lithology and reservoir space were revealed by observations of core,rock thin section,scanning electronic microscope( SEM),examining the physical properties,and X ray diffraction( XRD). The isotope fluid inclusion method and reservoir forming mechanism were further addressed. We determined that the rocks in E_3s_(1+2) are composed mainly of terrigenous detrital bearing-carbonate mixed rocks,terrigenous detrital-carbonate mixed rock,and carbonate bearing-terrigenous detrital mixed rock with high porosity and low-very low permeability; for the reservoir space,primary porosity,including intergranular and body cavity pores,as well as secondary pores like moldic pores,were generally found. According to research,snail-rich mixed shoal formed due to strong lake wave action in a saline lacustrine basin. Additionally,dolomitization in the earlier stage and the latter secondary erosion are dominant factors affecting the formation of the excellent reservoirs in the QHD29-2E structure.
引文
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