甘谷驿地区三叠系延长组长7-长10油层组沉积相研究

通过对岩性、测井特征、沉积相标志的综合分析,深入研究了甘谷驿地区长7—长10的沉积相及其分布特征,明确了各层沉积相的变化规律。该区长7-长10期主要发育三角洲平原、三角洲前缘、浅湖亚相沉积,三角洲前缘在长7-长10期均有大面积沉积,三角洲平原仅在长10期于近物源的东南部发育,浅湖在长7,长8期发育,分布于远离物源的西北部。

Sedimentary facies analysis of the Chang 7-Chang 10 Oil-bearing Beds,Triassic Yanchang Formation,in Ganguyi area

Using integrated lithology,character of well logging and indicators of sedimentary facies,detailed sedimentary analysis and lateral distribution patterns of Chang 7-Chang 10 Oil-bearing Beds in Ganguyi area were conducted and further switch patterns of sedimentary facies in certain bed were also deciphered. Our data reveal that Ganguyi area was predominated by delta-plain,delta-front and shallow lake facies deposits during Chang 7-Chang 10 period.In detail,the delta-front facies was widespread during the period,whereas the delta-plain was only presented in southeastern region during the Chang 10 stage and shallow lake occurred in southeastern region during Chang 7and Chang 8 stages.The lateral distribution patterns of sedimentary facies indicate the siliciclastic influx feeding the basin was derived from southeast direction.