松辽盆地乾安地区青山口组三段沉积微相特征
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P512.2

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国家重点基础研究发展计划(973)项目(编号2006CB701403)资助的成果


Characteristics of Sendimentary Facies for the Third Member of Qingshankou Formation in the Qian''an Area of the Songliao Basin
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    摘要:

    乾安地区位于松辽盆地南部中央坳陷区长岭凹陷的东北部。本区发育青三段高台子油层,顶界最浅埋深1518m,底界埋深2072m,青三段厚度平均97m,最大244m。青三段上部主要为泥岩,中、下部以粉砂岩为主和少量细砂岩、中粒砂岩和含砾砂岩,为一套湖泊三角洲相沉积。利用360口井的声波时差、自然电位、自然伽玛和视电阻率等曲线和20余口井的录井资料,识别出研究区青三段的沉积微相类型有:水下分流河道、席状砂、远砂坝、水下扇、河道间和前三角洲,总结了各微相特征,并建立了沉积微相地质—测井综合模式,完成了青三段早、中、晚期三期沉积微相平面图,分析沉积微相平面分布规律。早、中期三角洲为叶状三角洲,在此沉积时期,湖岸线相对稳定,河湖均有一定能量。物源供应较丰富,湖盆水体对河流带来的沉积物也有一定改造作用,属一般建设型三角洲。晚期三角洲体为伸长状三角洲,为典型的河控三角洲。在此沉积时期,湖盆开始较快速地水退,侵蚀基准面下降,河流搬运能力增大,物源供给充足。而湖能很弱,对河流带来的沉积物改造作用小。在不同的沉积时期,物源方向也有明显变化,说明保康沉积体系在此沉积期间物源的不稳定性。早期,物源来自南部;中期,物源来自西部;晚期,物源来自西北部。

    Abstract:

    The Qian'an area lies on the northeast of the Changling centre depression, south of the Songliao Basin. The Gaotaizi oil reservoir is developed within the third part of Qingshankou Formation in the area, with 1518 m of the upper burial boundary and 2072 m of bottom depth (averaging 97 m in thickness and 244 m at most). The upper part of the Qingshankou Formation consists of mainly mudstone, and the middle and the lower parts consist mainly of siltstone, with small amounts of fine sandstone, middle granule sandstone and gravel sandstone, which composes a series of lacustrine deltaic sedimentary system. Using the acoustic slowness, spontaneous potential, natural gamma, and apparent resistivity logs of 360 wells and the geologic logging data of more than 20 wells, the sedimentary microfacies types of the third part of Qingshankou Formation in the area are: underwater distributary's channel, sheet sand, distal sand bar, subaqueous fan, interchannel and prodelta, the characters of the sedimentary microfacies are summarized, the geology log synthesis mode of sedimentary microfacies is founded, the sedimentary microfacies ichnographies of the third part of Qingshankou Formation are completed including early, middle and late periods, the plane distribution rules of sedimentary microfacies are analyzed. Early and middle delta was leaflike delta, at this sedimentary period, lake shoreline was comparatively steady-going, the lake and the river both had some energy. The supply of source was comparatively abundant, the water body of lake basin had some rebuilding effect to the sediment which brought by the river, the delta is commonly constructive. The late period delta body is elongate shape, which is typical delta controlled by river. At this sedimentary period, the water in Lake Basin began to recede fleetly, the base level of erosion grew down, the schlep ability of river grew up, and the supply of source was abundant. But the energy of Lake Basin was very weak, the rebuilding effect to the sediment brought by river was comparatively weak, the orientation of source also had obvious change, the fact above showed that the source of the Baokang sedimentary system was precarious. At the early period, the provenance came from the south area; at the middle period, the provenance came from the west area; at the late period, the provenance came from the northwest area.

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单玄龙,胡金祥,任利军,王璞珺,郝国丽.2008.松辽盆地乾安地区青山口组三段沉积微相特征[J].地质学报,82(1):65-71.
SHAN Xuanlong, HU Jinxiang, REN Lijun, WANG Pujun, HAO Guoli.2008. Characteristics of Sendimentary Facies for the Third Member of Qingshankou Formation in the Qian''an Area of the Songliao Basin[J]. Acta Geologica Sinica,82(1):65-71.

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  • 收稿日期:2007-08-28
  • 最后修改日期:2007-11-02
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