车西洼陷沙三上亚段滑塌浊积砂体的沉积特征
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摘要
沙三上亚段沉积期,在车西洼陷南坡曹家庄断阶带的车40和车44断阶发育了数量众多的滑塌浊积砂体.通过大量的岩心观察和相关测试资料分析,对滑塌浊积砂体的岩性以及空间展布特征进行了研究.结果表明,浊积砂体具有成分成熟度和结构成熟度低的特点,结构和构造均反映砂体为滑塌后再沉积的产物.总结了滑塌浊积砂体的3种相序类型,即正粒序重力流型、正递变重力流型、砂泥互层型.对不同砂组储层的空间展布形态和发育规模进行了研究.分析了滑塌浊积砂体的成因机制,认为三角洲的快速推进为其形成提供了先决条件,而同沉积断裂强烈活动引发的地震是其最主要的触发机制.
During the depositing period of the upper submember of Sha 3,rich fluxoturbidite is developed in Che 40 and Che 44 fault blocks of Caojiazhuang step-fault zone in the southern slope of Chexi Subsag.The lithology and the spatial distribution are studied according to the observation of cores and the experimental data.The study results show that the fluxoturbidites have lower compositional and textural maturities,with the characteristics of slumping redeposition.There are three facies sequence types,namely,normal graded sequence gravity flow,normally grading gravity flow,interbed of sandstone and mudstone.The reservoir spatial distribution characteristics and the development scale of different sandstone groups are studied.The genetic mechanism of the fluxoturbidite sandbodies is analyzed,and it is held that the rapid advance of delta is the precondition to forming the fluxoturbidite sandbodies,and the seismic process aroused by the strong activity of syndepositional faults is the uppermost triggering mechanism.
During the depositing period of the upper submember of Sha 3,rich fluxoturbidite is developed in Che 40 and Che 44 fault blocks of Caojiazhuang step-fault zone in the southern slope of Chexi Subsag.The lithology and the spatial distribution are studied according to the observation of cores and the experimental data.The study results show that the fluxoturbidites have lower compositional and textural maturities,with the characteristics of slumping redeposition.There are three facies sequence types,namely,normal graded sequence gravity flow,normally grading gravity flow,interbed of sandstone and mudstone.The reservoir spatial distribution characteristics and the development scale of different sandstone groups are studied.The genetic mechanism of the fluxoturbidite sandbodies is analyzed,and it is held that the rapid advance of delta is the precondition to forming the fluxoturbidite sandbodies,and the seismic process aroused by the strong activity of syndepositional faults is the uppermost triggering mechanism.
引文
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[3]袁静,杜玉民,李云南.惠民凹陷古近系碎屑岩主要沉积环境粒度概率累积曲线特征[J].石油勘探与开发,2003,30(3):103-106.
[4]姜在兴.沉积学[M].北京:石油工业出版社,2002:59-87,365-367.
[5]吴元燕,陈碧珏.油矿地质学[M].北京:石油工业出版社,1996:153-160.
[6]饶孟余,钟建华,郭泽清,等.济阳坳陷牛庄洼陷沙三段三角洲前缘浊积岩特征[J].高校地质学报,2004,10(4):624-633.
[7]鄢继华,陈世悦,宋国奇,等.三角洲前缘滑塌浊积岩形成过程初探[J].沉积学报,2004,22(4):573-577.
[8]张关龙,陈世悦,鄢继华,等.三角洲前缘滑塌浊积体形成过程模拟[J].沉积学报,2006,24(1):50-54.
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[10]张鹏,王良书,丁增勇,等.济阳坳陷中-新生代断裂发育特征及形成机制[J].石油与天然气地质,2006,27(4):467-474.
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