罗家寨西南地区飞仙关早期沉积古地貌研究

运用测井曲线伽玛值来研究罗家寨西南地区的沉积古地貌,通过上百口井测井曲线对比,发现飞仙关组底部的电性变化主要集中在50m范围内,以飞仙关组底界50m段的伽玛加权平均值来研究飞仙关早期沉积古地貌,指出20～30 API的伽玛值区域可能是鲕粒最适宜生成的地区,且同时是后期鲕粒岩云化及鲕滩储层发育的有利区域,依据处于有利相带、较高古地貌、邻近井的云化及储层发育较好的原则,提出QL25-PX1区块和DT7-DT5区块两个勘探有利区块.为该区勘探提供了参考资料.

RESEARCH ON SEDIMENTARY PALAEOTOPOGRAPHY OF EARLY FEIXIANGUAN PERIOD AT SOUTHWEST LUOJIAZHAI AREA

Research on sedimentary palaeotopography at southwest Luojiazhai area is operated with logging Gama data. It is indicated, on the basis of the comparison with logging curve of almost 100 wells, that the electric property change at lower Feixianguan formation is concentrated at the 50 m range from the bottom. Research on sedimentary palaeotopography of early Feixianguan period is conducted with Gama average data of 50m section from bottom of the formation, it is indicated that Gama data range(20-30 API) would be favorable for oolitic development, and meanwhile it is also the favorable areas of late oolitic dolomite and oolitic reservoir development, according to favorable facies, high palaeotopography, dolomization at adjacent wells and good quality of reservoir development, the two favorable exploration blocks, QL25-PX1 area and DT 7-DT 5 are figured out.