CAJ | 학술논문

波阻抗反演是寻找隐蔽油气藏常采用的技术,但由于一些地区的钻井存在扩径现象,导致声波时差和密度曲线不能反映地层的真实情况,难于区分储层和围岩.为此,在进行反演之前必须对测井曲线进行环境校正,消除扩径对测井曲线带来的影响.以平湖油气田古近系渐新统花港组为例.在分析了该区扩径对测井曲线影响情况的基础上,提出了一套有效校正密度和声波时差曲线的方法:对测井资料进行标准化;应用未扩径处的标准化测井资料.建立自然伽马与密度的相关关系,并应用该关系结合压实校正对扩径处的密度曲线进行校正;应用Gardner公式,通过密度求取声波时差;在钙质发育处对上述校正的密度和声波时差进行钙质校正.应用效果表明,该方法是有效的.这给测井曲线环境校正提出了一个新的思路.
파조항반연시심조은폐유기장상채용적기술,단유우일사지구적찬정존재확경현상,도치성파시차화밀도곡선불능반영지층적진실정황,난우구분저층화위암.위차,재진행반연지전필수대측정곡선진행배경교정,소제확경대측정곡선대래적영향.이평호유기전고근계점신통화항조위례.재분석료해구확경대측정곡선영향정황적기출상,제출료일투유효교정밀도화성파시차곡선적방법:대측정자료진행표준화;응용미확경처적표준화측정자료.건립자연가마여밀도적상관관계,병응용해관계결합압실교정대확경처적밀도곡선진행교정;응용Gardner공식,통과밀도구취성파시차;재개질발육처대상술교정적밀도화성파시차진행개질교정.응용효과표명,해방법시유효적.저급측정곡선배경교정제출료일개신적사로.
Acoustic impedance inversion is commonly used in the exploration of subtle hydrocarbon reservoirs. However, when hole enlargement occurs during drilling, interval transit time and density curves cannot truly reflect the strata, making it difficult to distinguish between reservoirs and adjacent formations. Therefore, environment correction of logs should be performed before inversion to eliminate the influences of hole enlargement on the logs. The Oligocene Huagang Formation of the Paleogene in the Pinghu oil and gas field is taken as an example. Based on the analysis of the impacts of hole enlargement on logs in this field, several methods are proposed for correction of density and interval transit time curves. First, the logs are standardized. Then, the standard logs of intervals without hole enlargement are used to establish the relationship between the Gamma Ray and the density, which, in combination with compaction correction, is used to correct the density curves of intervals with hole enlargement. Finally, the Gardner formula is used to convert the density into transit time interval. Moreover, when the calcic is well-developed, the corrected density and transit time interval curves should be re-corrected for the calcic. This field application shows that this method is effective.