A deep understanding of the basic geologic characteristics fine-grained shale layers in Paleogene 1st sub-member Kong 2 Member (Ek21) Cangdong sag, Bohai Bay Basin, is achieved through observation 140 m continuous cores and systematic analysis over 1 000 core samples from two wells. Basic geological conditions for oil accumulation are proposed based on unconventional theory gas. The rock system mainly developed interbedded formation felsic shale, calcareous dolomitic carbonates; high quality...

Based on analysis of successive and whole cores over six hundred meters from the second Member Kongdian Formation (Kong 2 Member) fine-grained facies zone in central lake basin Cangdong sag, ten thousands systematic joint data, matching logging sedimentary characteristics is examined by means traditional petroleum geology, sedimentology, new theory method tight oil gas generation. The Kong sedimentation during maximum flooding Formation. Fine-grained half-deep to deep are widely distributed,...

Based on detailed core description and systematic joint test data, enrichment laws of continental shale oil have been examined deeply. Key technologies such as the identification quantitative evaluation method for sweet spot, precise design tracking horizontal well trajectory, low-cost volume fracturing technology whole process "slick water + quartz sand" formed. The research results show that pure Paleogene Kong 2 Member in Cangdong Sag is controlled by predominant fabric facies cross-over...

Based on observation of cores and thin slices analysis drilling, log test data, the gravity flow deposits characteristics formation conditions tight oil in lower first member Shahejie Formation (Es1x) were systematically analyzed Qikou Sag, Huanghua depression, Bohai Bay Basin. There mainly developed sandy debris flow, muddy classical turbidity study area, sandstone with boulder-clay is mostly origin, are mudstone or silty lumps, normal graded bedding a reliable sign turbidite. Affected by...

Based on systematic coring of 500 m Kong 2 Member the Paleogene Kongdian Formation in Cangdong sag Bohai Bay Basin, identification and XRD (X-Ray Diffraction) analysis over 1000 thin sections, a simplified method to quantitatively calculate contents fine grained minerals with conventional logging data such as acoustic travel time (AC) density log (DEN) has been proposed, quick lithologic "green mode" worked out this study. By fitting relationship between normalization curves mineral content...

Based on the tectonic evolution and depositional characteristics of Central–West African Rift System regional geologic background, oil gas accumulation in Termit rift superimposed basin were examined, factors controlling there discussed. The is a formed by two stages rifting early Cretaceous Paleogene, where Yogou Formation marine source rock widespread. sets reservoirs, first member Paleogene Sokor Formation, dominated quartz sandstone, have relatively good porosity-permeability...

Based on the merged 3D seismic data, well logging, formation testing, analysis and testing structural evolution, sedimentary reservoirs, thermal evolution of source rocks were investigated Paleogene Kongdian Formation in trough area Cangdong sag, Bohai Bay Basin. A conventional-unconventional hydrocarbon accumulation pattern rifted basin was revealed. The reservoir forming elements sag have a zonation feature terms reservoirs rocks. There are two types models, primary reformed trough....

The southwest margin of the Qikou Sag is a flexural gentle slope formed by deformation drape structure due to its underlying basement lifting. sedimentary period Lower Member 1 Shahejie Formation maximum extensional time Paleogene lacustrine basin. Debris from source areas in shortage. In broad littoral shallow lake, hundreds square kilometers carbonates are deposited and distributed stably. main lithologies sediments biolithite dolomite (micritic dolomitic limestone), dolomites mainly...

In recent years, several wells in the Qibei and Wumaying buried hills of Dagang Oilfield tapped oil Carboniferous–Permian Ordovician strata. This major breakthrough reveals that deep Paleozoic Bohai Bay is a new petroleum system. Through re-evaluating source rock, reservoir-cap combinations traps, it found gas mainly come from rock. The study shows strata are well preserved central-south Huanghua Depression developed two kinds reservoirs, Upper clastic rock Lower carbonate which form...

To better understand the micropore characteristics of lacustrine shale and develop quantitative methods for characterizing shale, reservoir space types, structures spatial distribution patterns effective pores in Member 2 Kongdian Formation Cangdong sag are studied using cores, thin sections, scanning electron microscopy (SEM), confocal laser (CLSM), nuclear magnetic resonance (NMR), whole-rock X-ray diffraction (XRD) data, etc. Various porosity calculation evaluated. The study results show...

Based on the classification of slope belts in rift basins, this paper discusses hydrocarbon accumulation characteristics and mechanisms for different slopes. The slopes Jizhong Huanghua depressions Bohai Bay Basin are classified into five types: flexure break, gentle platform slope, wide terrace faulted narrow-steep tilting terms pre-Tertiary sedimentation, tectonic activities, occurrence geometric configuration. Each individual shows various enrichment extent caused by mechanisms. break is...

To get a better understanding of the distribution pattern favorable reservoir belts in medium-deep clastic rocks Qikou sag Huanghua depression, and find out premium zone, characteristics controlling factors reservoirs were analyzed. Comprehensive study into structural setting, provenance, depositional system, properties shows that Paleogene has multi-sags multi-slopes, with slopes accounting for over 70% total area. A number large braided river (fan) delta front - gravity flow sand bodies...

Abstract The sequence stratigraphy framework of Paleogene Qikou Sag has been built in this paper. evolution law episodic subsidence expounded, with the analysis characteristic thickness, as well study consedimental tectonic activity, history, paleogeomorphology and coupling relationship among them. faults controlling action was dominant mechanism during rifting stage I, depression III, which embodies a process from intense disparity fault to integral subsidence. Meanwhile, under control...

When there are installations of air velocity sensors in the mining industry for real-time airflow monitoring, a problem exists with how monitored at fixed location corresponds to average velocity, which is used determine volume flow rate an entry cross-sectional area. Correction factors have been practically employed convert measured centerline velocity. However, studies on recommended correction sensor-measured cross sections still lacking. A comprehensive measurement was made Safety...

The origin of the Upper Paleozoic hydrocarbon accumulations in Huanghua Depression Bohai Bay Basin was studied by petrography and Rock-Eval pyrolysis on more than 90 coal, dark mudstone, carbonaceous mudstone samples, with 4 samples hydrous pyrolysis. Additionally, biomarker analysis oils produced from reservoirs were conducted. source rocks evaluated for their amounts type III kerogen content hydrogen-rich macerals. can be graded between fair excellent quality, showing that possess good...

Based on seismic and logging data, taking the downthrow fault nose of Binhai in Qikou Sag as object study, we analyzed characteristics, sand body distribution, fault-sand combinations hydrocarbon accumulation to reveal enrichment law fault-rich area depression lake basin. The results show that Cenozoic is characterized by east-west zoning, main part western segment simple structure, whereas broom-shaped faults eastern are complex including several groups faults. difference evolution controls...

Based on seismic, logging, formation testing, core and lab test data, this study analyzed the sequence division, facies features of deep water deposits modes, development large-scale gravity flow, reservoir physical properties their main controlling factors, proposed a classification standard prediction method favorable exploration areas in area Bin1 oil layers lower sub-member first member Paleogene Shahejie Formation Banqiao-Qibei slope zone Qikou sag, Bohai Bay Basin. The can be divided...

Atmospheric monitoring systems (AMS) have been widely used in underground coal mines the United States for detection of fire belt entry and other ventilation-related parameters such as airflow velocity methane concentration specific mine locations. In addition to an AMS being able detect a fire, data potential provide characteristic information growth - terms heat release rate exact location. Such is critical making decisions regarding fire-fighting strategies, personnel evacuation optimal...