摘要
在大庆长垣地区选取典型的取心井DQ-Z90对姚家组进行高频层序划分,共识别出91个超短期旋回、32个短期旋回、9个中期旋回、3个长期旋回,并绘制Fischer图解;同时,在该取心井周围另选取2口取心井DQ-N1和DQ-N2,利用自然伽马测井数据,运用线性回归、一阶差分等方法来计算沉积旋回个数和厚度,并利用Fischer图解法建立相应的湖平面变化曲线。结果表明,这3口取心井的Fischer图解存在可对比性,而且它们和松科1井的Fischer图解存在一致性,均直观地反映了高频湖平面的变化特征和长周期湖平面的变化趋势。由此证明此计算方法的可行性,并验证了Fischer图解的一致性。
This paper selects the typical coring well DQ-Z90 to study high frequency sequence stratigraphy of the Yaojia Formation of the Changyuan District, Daqing. Ninety-one ultra-short-term cycles, 32 short-term cycles, 9 mid-term cycles and 3 long-term cycles are identified, and the Fischer plot is drawn. Two other coring wells DQ-N1 and DQ-N2 neighboring DQ-Z90 are selected to calculate sedimentary cycles and thickness by using natural gamma logging data, linear regression and first-order differential. The Fischer plot is used to display lake level trends. The Fischer plots from the three wells can be compared and they are in accordance with that of Songke-1 well, reflecting the high- frequency lake level changes and long-term lake level trend. Thus it demonstrates the feasibility of the new method, and verifies the consistency of the Fischer plot.
出处
《资源与产业》
2013年第1期64-70,共7页
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