测井曲线在辽河坳陷太古宇变质岩潜山岩性识别中的应用

The Curve Application in the Recognition of Archean Metamorphic Buried-Hill Rocks in Liaohe Depression

摘要: 辽河坳陷太古宇潜山蕴藏着丰富的油气资源，2005年兴隆台潜山带内幕勘探的成功，使兴隆台潜山重新获得了亿吨级储量。随后大民屯凹陷胜西潜山、边台–曹台潜山深层勘探的突破，使辽河坳陷变质岩潜山的勘探掀起新的高潮。太古宇潜山岩石类型复杂，岩矿分析与鉴定认为，潜山岩石由变质岩和晚期岩浆侵入体两大类14个亚类30多种岩石类型组成。岩矿鉴定与测井曲线的有机结合识别太古宇潜山岩性，是辽河坳陷太古宇变质岩潜山内幕勘探获得成功的一大亮点。通过对潜山岩石的岩矿分析与鉴定，确定潜山的岩矿类型，在此基础上，研究每种岩类的岩石物理特征，最终确立了对太古宇潜山岩性反应敏感的自然伽玛、岩石密度、补偿中子、声波时差等常规测井曲线，建立了岩性与测井响应值及形态特征的对应关系，实现了太古宇潜山岩性的测井识别。潜山岩性与储层关系密切，岩性测井曲线识别的成功，大大提高了储层测井解释精度，为潜山储量申报提供了依据。

Abstract: Archean buried-hill in Liaohe depression is rich in oil and gas resource. Since 2005, the deep wells going through the inside buried-hill proved the existence of a thousand-meter-range oil reservoir, which formed one hundred million reserves. The exploration of metamorphic buried-hill in Liaohe is reaching new heights after the exploration breakthrough of Damintun Shengxi Buried-hill and Biantai-caotai buried hill. The rock types of Archean buried-hill are very complex. Through analysing rocks and minerals, it is known that the buried-hill rocks are composed of metamorphic rocks and the late magmatic intrusions which two classes and 14 subclasses of 30 kinds of rock types. The organic combination of curves and rock mineral identification in recognition of Archean buried-hill lithology was a big spot. The relationships between lithology and curves had been found by the study of rock’s physics characteristic, so we can identify the Buried-hill lithology through the dynamic integration of curves such as GR, DEN, CNL. The accuracy of reservoir log interpretation was improved greatly by the lithology analysis and the successful use of lithology curve, which all provided the basis for the reserve of burid-hill declaration.