Fischer图解及其沉积响应的计算机模拟──以泌阳断陷下第三系核三上段为例

FISCHER DIAGRAM AND ITS COMPUTER SIMULATION OF SEDIMENTARY RESPONSE A CASE STUDY ON THE UPPER MEMBER OF Eh3 IN BIYANG FAULTDEPRESSION

胡受权 陈国能 王英民 童崇光

Hu Shouquan Chen Guoneng Wang Yingmin Tong Chongguang

泌阳断陷下第三系核三上段包括三个跨时分别为1.08,1.40,1.02Ma的陆相层序,在双河赵凹地区表现为冲积扇-扇三角洲-湖相沉积体系配置。在这三个陆相层序中,共发育13个小层序组,其中可识别的小层序达50多个,其内部沉积微相达10余种。据此,采用Fischer图解法,求取了其可容空间变化速率曲线。在此基础上,采用自行研制的定量层序地层模拟系统,模拟了研究区下第三系核三上段沉积时期,可容空间变化过程与陆相层序响应特征。研究结果表明：泌阳断陷湖盆双河-赵凹地区下第三系核三上段的三个陆相层序,均为高匀速物源供给条件下形成的,其中S4层序的水进体系域,应列为该区油气勘探的重要目标层段。

The upper member of Eh in Biyang fault-depression includes 3 terrigenous sequences with the span ages of 1.08 Ma,1.40 Ma and 1.02 Ma respectively.A depositional system of fluvial fanfan delta-lacustrine facies was developed in ShuangheZhao'ao region of the depression.The 3 terrigenous sequences consist of 13 parasequence sets,more than 50 recognizable parasequences and 10 microfacies.The accommodation change curves of the terrigenous sequences were obtained by using Fischer diagram.The accommodation variation process and the terrigenous sequence response characters of the uper member of Eh in ShuongheZhao'ao area during deposition were simulated by the application of quantitative sequence stratigraphic simulation system.The results indicate that the terrigenous sequences of the study area formed under the condition of high and uniform velocity of material source supply,and that S4 sequence of TST should be taken as important target for hydrocarbon exploration.

10.11743/ogg19990116