IDENTIFICATION METHODS FOR EFFICIENT SOURCE ROCKS
IDENTIFICATION METHODS FOR EFFICIENT SOURCE ROCKS
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发表时间：
2003
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通讯作者：
Zhu Guang
中科院分区：
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作者：
Zhu Guang
长期以来，东营凹陷1—000～1—500米厚度的烃源岩被认为是有效烃源岩，因为暗色泥岩中有机碳含量在0.5%以上，这已成为识别有效烃源岩的合理标志。但精确的油源对比表明，烃源岩厚度不可能达到1千米以上。沙四上段和沙三下段烃源岩有机碳含量为1.5%，主要形成油气藏，控制了东营凹陷百万吨级油气田的形成。因此，有效烃源岩的最低有机碳含量应根据该地区的实际情况确定。首先，通过油源对比方法识别有效烃源岩层。结合不同层位的沉积和地球化学特征，可以得到有效烃源岩的评价标准。利用测井方法可以实现非烃源岩中间层的去除以及烃源岩的各种参数。最终完成有效烃源岩的识别与评价。
For a long time, the source rocks from 1?000 to 1?500 meters in thickness were thought to be the efficient source rock in Donying depression, because the content of organic carbon in the dark mudstones is over 0.5 percent, which has been the reasonable mark for identifying the efficient source rock. But the precise oil source comparison shows that the thickness of the source rocks is impossible up to 1?000 meters or more. The source rocks containing organic carbon of 1.5 percent in the upper Sha 4 and the lower Sha 3 subsections mainly attributed to hydrocarbon reservoirs and controlled the formation of millions tons of oil gas fields in Dongying depression. Therefore, the minimum organic carbon content of the efficient source rocks should be determined according to the actual condition in that area. Firstly, the efficient source rock layers may be identified with the oil source comparison method. Then the evaluation standard of the efficient source rocks can be obtained with the combination of sedimentary and geochemistry characteristics of the different layers. The rid of intermediate layer in the non source rock and kinds of parameters about source rocks can be achieved by using logging method. Finally, the identification and evaluation of the efficient source rocks may be finished.