利用亲陆元素和陆源化合物研究物源与隐蔽储层的新方法

A new method to study provenance and subtle reservoir using continental elements and terrigenous minerals

在莺歌海盆地发现了2个新的物源标志,即亲陆元素Al/Ca和陆源粘土矿物高岭石/蒙脱石比值的异常高值,据此提出了一种研究物源和隐蔽储层的新方法:如果井点的Al/Ca或高岭石/蒙脱石比值在沉积区域呈现异常高值,则可判断该井点位于物源主方向上,钻遇了储层或预示附近有隐蔽储层存在;如果处在沉积物搬运路径上的井点其Al/Ca或高岭石/蒙脱石比值未呈现异常高值,则表明附近存在物源及储层的结论有风险,可反推物源与储层可能不存在。结合单井相、区域沉积相、地震等资料来应用这一新方法,有助于判断物源与储层是否存在以及发现隐蔽储层,加快油气勘探的发现。

Two new provenance indicators are founded in Yinggehai basin, i.e. abnormal high ratios of continental elements （Al/Ca） and terrigenous clay minerals （Kaolinite/Montmorillonite）, from which a new method to study provenance and subtle reservoir are developed. For a well location, if Al/Ca and Kaolinite/Montmorillonite ratios are abnormal high relative to the related sedimentary province, it can be determined that the well is in the main trend of provenance, or that reservoir rocks may occur nearby. For well locations on sediment transportation pathways, if the ratios of Al/ Ca and Kaolinite/Montmorillonite are not abnormal high, it may be indicated that the conclusion on nearby occurrences of provenance and reservoir is risky, or that provenance and reservoir does not exist. In combination with single-well facies, regional facies and seismic data, the new method can be used to determine occurrences of provenance and reservoir, to find subtle reservoir rocks and to accelerate hydrocarbon exploration.