| Fulin Sag lies on the southeast of Zhanhua Depression, which apart from Gunan depression with Kenli fault belt, border upon Kendong-Qingtuozi arch, and overlayed with Chenjiazhuang arch. Fulin Sag has the area about 360 square kilometers. The oil & gas exploration of Fulin depression started in 1967. Up to now, three-dimension seismic data has overcast the whole explore area. Fifty exploratory wells meet the stratum from upper Mesozoic to Quaternary,and two main oil-bearing series was found, that is Dongyingzu stratum and shahejiezu stratum. In the past 40 years, restricted by the geological condition, a few small scale reservior was found and significant breach is not appeared.On the basis of core observation,facis symbol could be distinguished. Combined with logging and seismic data, single-well facies division could be made. And the spatial distribution of sedimentary facies could be confirmed. In Fulin Sag, 6 sedimentary facies could be distinguished, that is braided fluvial delta facies, fan delta facies,nearshore subaqueous fans facies,shore-shallow lake facies,beach bar facies and half deep-deep lake facies. Mineral constituent distribution figures were made to reflect the provenance charicteristic. It can be concluded that western provenance area is mainly the volocanic rocks and metamorphic rocks, eastern provenance area is mainly the metamorphic rocks,northern provenance area is mainly the sedimentary rocks and the metamorphic rocks.In this study, it can be concluded that the sedimentary environment in Es4 sedimentary period is shore-shallow lake to half deep-deep lake with the characteristic of semiarid to half-humid and brackish water to salt water. The sedimentary is mainly the proximal accumulation which comes from northern Kenli arch and eastern Kendong-Qingtuozi arch. Fan Delta Front subficies is the mainly sedimentary facis. In Es3 sedimentary period, the sedimentary environmentis mainly the semitropics half-humid to humid and the brackish water to salt water.The sedimentary facis distribution reveals that the main provenance comes from the eastern kendong arch and the western Chenjiazhuang arch. The western provenance is mainly the sandstone sedimentary and the eastern provenance is mainly the Sand-gravel and Gravel Sand. The root and the middle of fan subficies of the Nearshore Subaqueous Fans facies is the mainly sedimentary facis in Shasaxia sedimentary period. The main provenance in Shasanzhong sedimentary periodis comes from eastern Kendong-Qingtuozi arch. The main provenance in Shasanshang sedimentary periodis mixed the northweatern Chenjiazhuang arch and eastern Kendong-Qingtuozi arch provenance。... |
