The analysis of reservoir-forming controlling factors shows that oil accumulation in the low-stand fan is mainly controlled by source rocks, reservoirs, migration paths of oil and gas (syndepositional faults and unconformity surfaces) and the distribution of syndepositional faults and reservoirs, and it is lithologic-structural oil reservoir.
Based on the bore section, combining with the study on lithology, well logging, seismic facies and sequence type, the structure of the sequence in the deeply down-faulted Dongying Sag is analyzed emphasizing on the low-stand fan depositional type, its controlling factors and depositional sequence.
In recent years,based on the theory of “the exploration of the lithological lower-stand fan deposit group along the fault slope break”,1640 million barrels of geological crude oil reserves have been proved in the faulted lacustrine of the Jiyang Basin,and 20 million barrels of oil production have been achieved.
1. "Four histories" include basin filling, tectonic evolution, organic matter mature and diagenesis histories. It is the basement of the evaluation for the hydrocarbon exploration targets, and it is important to analysis the specific basin.
The study results show that the lowstand sand bodies such as incised channel filling,lowstand wedges and fans controlled by the structural slope_break zones are favorable for forming the subtle reservoirs.
THE CHARACTERISTICS OF NEOCENE SEQUENCE STRATIGRAPHY AND LOWSTAND FANS IN QIONGDONGNAN BASIN
Low stand delta sand body and lowstand fan sand body are the most favorable ones for oil and gas exploration, and highstand delta sand body, highstand sublacustrine fan sand body, braided river sand body and fan-delta sand body are secondary.
We have classified these crinoid species into four groups based on the stalk length and fan density, e.g., long stalk with low fan density, long stalk with high fan density, short stalk with low fan density, and short stalk with high fan density.
A good rule is high flame, high fan and low flame, low fan.
Desiccant systems for these broad market applications must have low first cost, low fan requirements, and good energy efficiency.
To minimize noise problems, the ductwork for these units should be designed so that proper airflow can be accomplished with low fan speeds.
The AU arranges these components in a streamlined, pipelined configuration that exhibits low fan out.