Discovery of Palaeozoic Karsts in the Qaidam Basin and Their Oil and Gas Prospects

Objective Complex geological factors have been constraining the oil and gas exploration in the Paleozoic strata of the Qaidam Basin,although there are high-quality hydrocarbon source rocks.One of the most important reasons may be reservoir densification due to the multiple stages of destructive cementation,which has hindered our understanding of the Paleozoic petroleum enrichment rules in the Qaidam basin.In recent years.

IT tool improves oil prospects

Drilling an oil well costs tens of millions of dol-lars,yet there iS no guarantee that the well is go-ing to be gushing with oil or gas.Anything that canreduce that uncertainty will potentially bring aboutsavings in the millions of dollars.And Shaoqing Sunhas found a nice niche in this field.

Geochemical studies of the Silurian oil reservoir in the Well Shun-9 prospect area, Tarim Basin, NW China

Commercial oil flow has been obtained from the sandstone reservoir of the Lower Silurian Kelpintag Formation in the Well Shun-9 prospect area.In the present studies,10 Silurian oil and oil sand samples from six wells in the area were analyzed for their molecular and carbon isotopic compositions,oil alteration（biodegradation）,oil source rock correlation and oil reservoir filling direction.All the Silurian oils and oil sands are characterized by low Pr/Ph and C21/C23 tricyclic terpane（〈1.0） ratios,＂V＂-pattern C27-C29 steranes distribution,low C28-sterane and triaromatic dinosterane abundances and light δ13C values,which can be correlated well with the carbonate source rock of the O3 l Lianglitage Formation.Different oil biodegradation levels have also been confirmed for the different oils/oil sands intervals.With the S1k2 seal,oils and oil sands from the S1k1 interval of the Kelpintag Formation have only suffered light biodegradation as confirmed by the presence of ＂UCM＂ and absence of 25-norhopanes,whereas the S1k3-1 oil sands were heavily biodegraded（proved by the presence of 25-norhopanes） due to the lack of the S1k2 seal,which suggests a significant role of the S1k2 seal in the protection of the Silurian oil reservoir.Based on the Ts/（Ts＋Tm） and 4-/1-MDBT ratios as reservoir filling tracers,a general oil filling direction from NW to SE has been also estimated for the Silurian oil reservoir in the Well Shun-9 prospect area.

New prospecting progress using information and big data of coal and oil exploration holes on sandstone-type uranium deposit in North China

1.Objective A series of Mesozoic-Cenozoic continental sedimentary basins exist in North China,coexisting with coal,oil/gas,and salt resources.Many previous drilling projects have been conducted within these basins to explore coal,petroleum,and mineral resources,however,these data have not been integrated due to different industries owners.In order to efficiently explore the large-sized,easily extracted,and environmentally friendly,sandstone-type uranium deposits,previous coal and oil exploration drilling-hole data are systematically collected, processed,and analyzed to improve the sandstone-type uranium prospecting exploitation.At the same time,we also discussed the uranium source,ore-forming process and model for the sandstone-type uranium deposits.

Prospective prediction and exploration situation of marine Mesozoic-Paleozoic oil and gas in the South Yellow Sea

The South Yellow Sea Basin is a large sedimentary basin superimposed by the Mesozoic-Paleozoic marine sedimentary basin and the Mesozoic-Cenozoic terrestrial sedimentary basin, where no oil and gas fields have been discovered after exploration for 58 years. After the failure of oil and gas exploration in terrestrial basins, the exploration target of the South Yellow Sea Basin turned to the marine Mesozoic- Paleozoic strata. After more than ten years' investigation and research, a lot of achievements have been obtained. The latest exploration obtained effective seismic reflection data of deep marine facies by the application of seismic exploration technology characterized by high coverage, abundant low-frequency components and strong energy source for the deep South Yellow Sea Basin. In addition, some wells drilled the Middle-Upper Paleozoic strata, with obvious oil and gas shows discovered in some horizons. The recent petroleum geological research on the South Yellow Sea Basin shows that the structure zoning of the marine residual basin has been redetermined, the basin structure has been defined, and 3 seismic reflection marker layers are traceable and correlatable in the residual thick Middle-Paleozoic strata below the continental Meso-Cenozoic strata in the South Yellow Sea Basin. Based on these, the seismic sequence of the marine sedimentary strata was established. According to the avaliable oil and gas exploration and research, the marine Mesozoic-Paleozoic oil and gas prospects of the South Yellow Sea were predicted as follows.(1) The South Yellow Sea Basin has the same sedimentary formation and evolution history during the sedimentary period of the Middle-Paleozoic marine basin with the Sichuan Basin.(2) There are 3 regional high-quality source rocks.(3) The carbonate and clastic reservoirs are developed in the Mesozoic- Paleozoic strata.(4) The three source-reservoir-cap assemblages are relatively intact.(5) The Laoshan Uplift is a prospect area for the Lower Paleozoic oil and gas, and the Wunansha Uplift is one for the marine Upper Paleozoic oil and gas.(6) The Gaoshi stable zone in the Laoshan Uplift is a favorable zone.(7) The marine Mesozoic-Paleozoic strata in the South Yellow Sea Basin has the geological conditions required to form large oil and gas fields, with remarkable oil and gas resources prospect. An urgent problem to be addressed now within the South Yellow Sea Basin is to drill parametric wells for the Lower Paleozoic strata as the target, to establish the complete stratigraphic sequence since the Paleozoic period, to obtain resource evaluation parameters, and to realize the strategic discovery and achieve breakthrough in oil and gas exploration understanding.

The influence factors of gas-bearing and geological characteristics of Niutitang Formation shale in the southern margin of Xuefeng Mountain ancient uplift: A case of Well Huangdi 1

In order to evaluate the geological characteristics and gas-bearing factors of Niutitang Formation within the Lower Cambrian of northern Guizhou,the Huangping area located at the southern edge of the ancient uplift belt of Xuefeng Mountain was selected as the target area,and Well Huangdi 1 was drilled for the geological survey of shale gas.Through geological background analysis and well logging and laboratory analysis such as organic geochemical test,gas content analysis,isothermal adsorption,and specific surface area experiments on Well Huangdi 1,the results show that the Niutitang Formation is a deep-water shelf,trough-like folds and thrust fault.The thickness of black shale is 119.95 m,of which carbonaceous shale is 89.6 m.The average value of organic carbon content is 3.55%,kerogen vitrinite reflectance value is 2.37% and kerogen type is sapropel-type.The brittle mineral content is 51%(quartz 38%),clay mineral content is 38.3%.The value of porosity and permeability are 0.5%and 0.0014 mD,which the reservoir of the Niutitang Formation belongs to low permeability with characteristics of ultra-low porosity.The gas content is 0.09‒1.31 m^3/t with a high-value area and a second high-value area.By comparing with the geological parameters of adjacent wells in the adjacent area,the accumulation model of“sediment control zone,Ro control zone,structure controlling reservoir”in the study area is proposed.Therefore,deep-water shelf-slope facies,Ro is between high maturity-early stage of overmaturity and well-preserved zones in the Niutitang Formation in this area are favorable direction for the next step of shale gas exploration.

Development and prospect of separated zone oil production technology

This article outlines the development of separated zone oil production in foreign countries,and details its development in China.According to the development process,production needs,technical characteristics and adaptability of oilfields in China,the development of separate zone oil production technology is divided into four stages:flowing well zonal oil production,mechanical recovery and water blocking,hydraulically adjustable zonal oil production,and intelligent zonal production.The principles,construction processes,adaptability,advantages and disadvantages of the technology are introduced in detail.Based on the actual production situation of the oilfields in China at present,three development directions of the technology are proposed.First,the real-time monitoring and adjustment level of separated zone oil production needs to be improved by developing downhole sensor technology and two-way communication technology between ground and downhole and enhancing full life cycle service capability and adaptability to horizontal wells.Second,an integrated platform of zonal oil production and management should be built using a digital artificial lifting system.Third,integration of injection and production should be implemented through large-scale application of zonal oil production and zonal water injection to improve matching and adjustment level between the injection and production parameters,thus making the development adjustment from"lag control"to"real-time optimization"and improving the development effect.

Prospects of borehole NMR instruments and applications Dedicated to Professor Chaohui Ye on the occasion of his 80th birthday

Borehole nuclear magnetic resonance(NMR)is a powerful technology to characterize the petrophysical properties of underground reservoirs in the petroleum industry.The rising complexity of oil and gas exploration and development objectives,as well as the novel application contexts of underground reservoirs,have led to increasingly demanding requirements on borehole NMR technology including instrument design and related processing methods.This mini review summarizes the advances and applications of borehole NMR instruments along with some future possibilities.It may be helpful for researchers and engineers in the petroleum industry to understand the development status and future trends of borehole NMR technology.

Castor oil as booster for colon capsule endoscopy preparation reduction: A prospective pilot study and patient questionnaire

BACKGROUND Preparation for colon capsule endoscopy(CCE)requires a large liquid laxative volume for capsule excretion,which compromises the procedure's tolerability.AIM To assess the safety and utility of castor oil-boosted bowel preparation.METHODS This prospective cohort study including 20 patients(age range,16-80 years;six men and 14 women)suspected of having colorectal disease was conducted at Kindai University Hospital from September 2017 to August 2019.All patients underwent CCE because of the following inclusion criteria:previous incomplete colonoscopy in other facility(n=20),history of abdominal surgery(n=7),or organ abnormalities such as multiple diverticulum(n=4)and adhesion after surgery(n=6).The exclusion criteria were as follows:Dysphagia,history of allergic reactions to the drugs used in this study(magnesium citrate,polyethylene glycol,metoclopramide,and castor oil),possibility of pregnancy,possibility of bowel obstruction or stenosis based on symptoms,or scheduled magnetic resonance imaging within 2 wk after CCE.The primary outcome was the capsule excretion rate within the battery life,as evaluated by the total large bowel observation rate,large bowel transit time,and bowel creasing level using a fivegrade scale in different colorectal segments.The secondary outcomes were complications,colorectal lesion detection rates,and patients’tolerability.RESULTS The castor oil-based regimen was implemented in 17 patients.Three patients cancelled CCE because they could tolerate castor oil,but not liquid laxatives.The capsule excretion rate within the battery life was 88%(15/17).The mean large bowel transit time was 236 min.Approximately 70%of patients had satisfactory colon cleansing levels.CCE detected colon polyps(14/17,82%)and colonic diverticulum(4/12,33%).The sensitivity,specificity,and diagnostic accuracy rates for detecting colorectal polyps(size≥6 mm)were 76.9%,75.0%,and 76.4%,respectively.The sensitivity,specificity,and diagnostic accuracy rates for detection of diverticulum were 100%each.Twelve patients(71%)rated CCE as more than“good”,confirming the new regimen’s tolerability.No serious adverse events occurred during this study.CONCLUSION The castor oil-based regimen could reduce bowel preparation dose and improve CCE tolerability.

Development Prospective ofCNPC's Lube Oil Production

Aftertherestructuringprocess,CNPCgotstrengthenedinlubricatonoilproductionintermsofresource,technologyandproductioncapacity.Howtomakefulluseoftheseadvantagesandenlargethemarketsharearethecriticalissuestohandle.CNPCshallacceleratethetechnologicalrenova...

The current situation and prospect of oil steel pipe in China

The oil steel pipe in the petroleum industry is very important for its high price, large consumption volume and great effect on the development of petroleum industry. The oil steel pipe mainly includes oil well pipe (drill pipe, drill collar, casing and tubing etc.) and oil-gas transportation pipe. This paper is an attempt to make a comprehensive review on the current situation and prospect of the oil steel pipe in China, presenting the past , today and future of the China oil pipe. The first section is a historical review of the China oil pipe. The developing course and progress of the oil steel pipe products are presented. The second section is about the current situation of the China oil pipe. The general situation of the China’s steel pipe corporation and their products types, capability, etc. is introduced. The third section is about the prospect of the China oil pipe. This part mainly describes the new product research and development in China steel pipe corporations, which are facing more and more strict technical requirements of the petroleum industry in oil pipe, and reveals the prosperity of China’s steel pipe corporations.

Prospects for Distributed Energy Systems in China Released in Beijing

On the afternoon of October 30,the International Energy Agency(IEA)and china5e.com held a joint press conference in Beijing for the release of an IEA report:Prospects for Distributed Energy Systems in China.At present,China is at a crucial stage of economic restructuring,seeking to transform its mode of economic growth.At the same time,it is also facing increasingly serious environmental challenges such as air pollution.To meet these objectives and promote energy transformation,

团体标准促进我国油气行业创新发展的前景

我国鼓励具备相应能力的社会组织和产业技术联盟协调相关经营主体共同制定满足市场和创新需要的标准。虽然我国油气行业团体标准刚起步,但是纵观世界,团体标准在世界石油工业发展史中发挥过重要的作用。本文回顾了团体标准在世界石油工业史中的重要作用,分析团体标准与其他类别标准的利弊、在我国油气行业的机遇和挑战,可以预见的是,团体标准的蓬勃发展必将促进我国油气行业高速创新发展。

适应川西地区复杂油气地质条件的物探技术探讨

川西地区以负向构造为主,多期构造演化叠加,断裂发育、储层致密,气水关系复杂,物探采集、成像及储层预测技术适应性较差。概要介绍了分公司在川西地区油气勘探开发历程,总结了随着地质目标变化而形成的物探关键技术及其发展过程,分析了现有采集、处理、解释技术对地质目标的适用性及优缺点,剖析了侏罗系近源薄互层致密砂岩气藏、须家河近源致密气藏以及山前带超深层碳酸盐岩气藏等下一步重点勘探开发目标的研究难点,展望了高精度成像、低频资料储层预测、多尺度断裂系统刻画以及油气水识别等关键物探技术的发展和应用前景,对应用物探前沿技术支撑川西复杂油气区高效勘探开发具有一定的指导意义。

油气行业多重突破推进能源安全新战略

石油天然气行业是我国“四个革命、一个合作”能源安全新战略的“主战场”。10年来,我国在油气生产、消费、体制改革、科技创新、国际合作等方面,取得了多重突破和显著进展,有力支撑了我国经济社会的安全和绿色发展。面对未来国内外宏观经济和能源发展的新形势,进一步深入推进能源安全新战略,加快规划建设新型能源体系,油气行业需要兼顾能源革命和安全转型的重要目标,任重道远。