There are obvious differences between two analytical methods named classic sequence stratigraphy and Cross' high-resolution sequence stratigraphy on identification method, applicability, inner structure and the knowledge of formation distribution of the sequence in the terrestrial rift basin.
On the basis of discussion of close relation of high-resolution sequence strata and sedimentary facies with reservoir development, the favourable reservoir in Chang 6 member has been evaluated and forecasted.
In order to offer strategic formations and zones for regional exploration, a hard nut to crack is to clarify the classification and distribution of Jurassic sedimentary facies and sedimentary microfacies and to improve the resolution of seismic data to determine the relation between oil and gas distribution, sequence strata, sedimentary system, second-order structure zone and reservoir-seal assemblage.
On the basis of systematic analysis of outcrops, well cores, log and seismic stratigraphy, the stratigraphic sequence of the Middle Jurassic in northern Chaoshui basin was divided into 4 third-order sequences and 2 second-order sequences.
Through analysis of the layer stratigraphy accurately,the stratigraphic sequence section of high distinguish is formed. Then depend on lithology reversing,reservoir predicting and oil to resource correlation,oil reservoir is considered existing in the area. Finally various types of oil reservoir forming mechanism and position are pointed out,and the next exploration target is defined.
The principles of sedimentology and sequence stratigraphy were used to research the mode of sequence stratum of coastal alluvial environment. An universal mode for sequence stratum of alluvial-fluvial facies was established. The relationship between system tract and sedimentary facices was discussed on the analysis of river types of the Neogene in Jiyang Depression.
Based on the 1∶250,000 and the 1∶50,000 regional geological survey mapping,the essential sequences of Lithostratigraphic unit will change the static description into the dynamic law survey of basal sequences,which elucidates the relationship of essential sequence law and sequence stratum.
An application of micropaleontology-sequence stratigraphy method in stratigraphic division
A method of micropaleontology-sequence stratigraphy is proposed herein.
The study considers Well Zhangcan 1 as an example to prove that the scheme of stratigraphic division is feasible by conducting micropaleontology-sequence stratigraphy in the Guanjiapu area of the Chengbei faultstep zone.
The application of micropaleontology-sequence stratigraphy method indicates that Member 1 of the Shahejie Formation in Well Zhuanghai 808×1 and Member 3 of the Dongying Formation of the Paleogene exist.
Therefore, the analyses of sequence stratigraphy are the key for predicting the presence of carbonate reservoirs.
The analysis of facies associations revealed that the formation was deposited as a symmetrical transgressive-regressive rock succession representing a common stratigraphic sequence.
The bottom of the stratigraphic sequence of the Dzhugdzhur deep-seated granulite complex was determined to consist of a stratified metabasite-enderbite association.
2(a), (b)), reflecting the evolutional difference of oceanic environment and stratigraphic sequence between the upper and lower layers separated by the depth of 160 cm.3.Through a correlation of δ18O values, the core from No.
Human beings' activities on tidal flat have disturbed the vertical distribution of sediments in stratigraphic sequence and accelerated the sedimentation rates.
Measurements of ground resistivity or radar surveys in a raster of 0.5 or 0.5×0.05?m, respectively, are used to gain information on archaeological structures and on the main stratigraphic sequence of sites covering up to 0.5?ha per day.