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Exploratory and Descriptive Study of the Kimberlite Massif of Boya-02 at Eastern Kasai in the Democratic Republic of congo

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Journal of Geoscience and Environment Protection 2024年第1期12卷 130-144页

作者： Arnold Onya Ngila Ivon Ndala Tshiwisa Ruben Koy Kasongo Serge Diemo Alain Cibumba Cibumba Chamira Fwani Pambu Dona Kampata Mbwelele Centre National de Télédétection (CNT) Kinshasa The Democratic Republic of Congo Department of exploration Faculty of Oil and Gas University of Kinshasa Kinshasa The Democratic Republic of Congo Geo-Hydro-Energy Research Group Department of Geosciences Faculty of Sciences and Technologies University of Kinshasa Kinshasa The Democratic Republic of Congo

The Boya-02 kimberlite was identified at depth by geophysical survey work (a single-probe AM survey in 1997 and a gravity survey in 2006) that De Beers DRC exploration carried out around anomaly 193/172/0019. This anomaly located approximately 50 km southwest of the town of Mbuji-Mayi in the Kasaï-oriental Province in the DRC should therefore be the subject of detailed exploration with the aim of better identifying and describing this kimberlite. Thus, through exploratory work and cross-checking of geophysical and geological data, the discovery of this Massif was made by drilling on the aeromagnetic anomaly 193/172/X298. Based on drilling, sampling and laboratory petrographic analysis reports, the Boya-02 kimberlite was classified among highly diluted re-sedimented volcaniclastic kimberlites (KVR), rich in olivine and incidentally in quartz and poor in juvenile substances. This kimberlite represents a deposit of very low economic interest following extremely high dilution. The Boya-02 kimberlite was modeled using ground magnetism data. It is a complex anomaly comprising 2 components with variable amplitude appearing on a subtly magnetized linear detail. The modeled dimensions of two components of this anomaly are 0.32 Ha and 0.2 Ha at depths of 32 m & 14 m for the deposits to the West and the East respectively. Garnet data for the Boya-02 occurrence reports a maximum Pmin value of 49.7 kbar (207 garnets). These data demonstrate the high diamond potential which assumes a conductive cratonic geotherm of 40 mWm2.

关键词： Exploratoire Massif Kimberlitique Kasaï oriental

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基于空间协模拟的叠前地震随机反演方法

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石油地球物理勘探 2024年第2期59卷 268-278页

作者：曹亚梅周辉于波张元高戴世立中国石油大学(北京)油气资源与工程全国重点实验室北京102249 中国石油大学(北京)cnpc物探重点实验室北京102249 东北石油大学地球科学学院黑龙江大庆163318 大庆油田勘探事业部黑龙江大庆163453

无论是迭代类随机反演还是线性贝叶斯随机反演,一般采用序贯类随机模拟表征油藏的非均质性。序贯类方法大多依赖变差函数或训练图像描述模型参数的空间相关性,需要逐点计算模拟结果,因此并行实现困难、计算效率低。为此,将一种条件化快... 详细信息

无论是迭代类随机反演还是线性贝叶斯随机反演,一般采用序贯类随机模拟表征油藏的非均质性。序贯类方法大多依赖变差函数或训练图像描述模型参数的空间相关性,需要逐点计算模拟结果,因此并行实现困难、计算效率低。为此,将一种条件化快速傅里叶变换滑动平均(FFT⁃MA)模拟引入线性反演框架,提出基于空间协模拟的叠前地震随机反演方法。首先,在贝叶斯框架下整合地震数据和测井低频信息,获得弹性参数的后验概率分布。然后,根据FFT⁃MA算法生成概率场,以测井数据为条件数据对贝叶斯后验应用概率场协同模拟,从而获得井震数据约束的叠前弹性参数高分辨率随机反演结果。该方法无需迭代更新模型参数,能极大地提高随机反演的计算效率。最后,由模型试算和实际资料应用测试方法的效果。模型试算表明,所提方法在高分辨率储层预测及计算效率方面均优于常规方法,可稳定、准确地描述小尺度储层特征。实际资料应用表明,所提方法得到的高分辨反演结果与测井数据契合良好,提高了随机反演在薄储层定量表征方面的实用性。

关键词：高分辨率地质统计学 FFT⁃MA算法随机反演协同模拟

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comprehensive Interpretation Technique for geophysical Data and Its Applications

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Applied Geophysics 2003年第1期6卷 67-69页

作者： SongJingming RanXuefeng HaoHongjiang BureauofgeophysicalProspecting CNPC

Addressed in this paper was the comprehensive interpretation of all kinds of data and its applications in oil/gas exploration. Real examples were used to illustrate the importance of the comprehensive interpretation o... 详细信息

关键词：地球物理学数据处理应用软件油气勘探

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oncausal spatial prediction filtering based on an ARMA model

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Applied Geophysics 2009年第2期6卷 122-128页

作者： Liu Zhipeng Chen Xiaohong Li Jingye cnpc Key Lab of geophysical exploration China University of Petroleum Beijing 102249 China State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing 102249 China Key Laboratory for Hydrocarbon Accumulation Mechanism Ministry of Education China University of Petroleum Beijing 102249 China

conventional f-x prediction filtering methods are based on an autoregressive model. The error section is first computed as a source noise but is removed as additive noise to obtain the signal, which results in an assumption inconsistency before and after filtering. In this paper, an autoregressive, moving-average model is employed to avoid the model inconsistency. Based on the ARMA model, a noncasual prediction filter is computed and a self-deconvolved projection filter is used for estimating additive noise in order to suppress random noise. The 1-D ARMA model is also extended to the 2-D spatial domain, which is the basis for noncasual spatial prediction filtering for random noise attenuation on 3-D seismic data. Synthetic and field data processing indicate this method can suppress random noise more effectively and preserve the signal simultaneously and does much better than other conventional prediction filtering methods.

关键词： AR model ARMA model noncasual random noise self-deconvolved projection filtering

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Effects of Integrated exploration in Hydrocarbon-Prospective Areas of South China

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Applied Geophysics 2003年第1期6卷 6-11页

作者： KongFanshu Zhengli LiZhiming ChengduUniversityofTechnology BureauofgeophysicalProfpecting CNPC

The complicated topography, morphology and geology are characteristic of South China, where the frequently covered waters and igneous bodies and widely exposed carbonates are difficult to seismic survey. This paper describes the effect of combining exploration of gravitational, magnetic and electric methods in the complicated hydrocarbon areas in South China by some case histories. Many year''s exploration practices in the exploring areas of more than 20 show that the non-seismic integrated (gravity/magnetic/electric) geophysical prospecting can play an important role not only in regional assessment, basin optimization and early basin evaluation,but also in finding objective of low resistance in areas of exposed carbonate with high resistance, contouring local structure, outlining igneous body and reef, and differentiating rock facies of basement. The results of the non-seismic integrated geophysical survey have pointed out the direction for deploying next prospecting in the specific areas of South China and the valuable experiences have been accumulated to carry out hydrocarbon-hunting in the future.

关键词：碳氢化合物地形学地质学形态学碳酸盐地球物理勘探重力勘探磁法勘探电法勘探

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Discovering New Oilfield within 18 Months Using Integrated geophysical Technology

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Applied Geophysics 2003年第1期6卷 12-16页

作者： JiLiansheng KongFanshu SunJianchen BureauofgeophysicalProspecting CNPC

The Yanqi basin is small and located at the northeastern corner of the Tarim basin. Before April 1993, the Yanqi basin was only surveyed with surface geology and seldom known among the explorers. After that, the gravitational, magnetic and MT prospecting were carried out and found some interesting local structures, which might be oil-and-gas-bearing. A few seismic lines were utilized to confirm them. An exploratory well was drilled in the summer of 1994 and discovered oil flow with industrial value in Oct., the same year. The petroleum exploration obtained breakthrough in the Yanqi basin in only 18 months.

关键词：地球物理学塔里木盆地地球物理勘探重力勘探磁法勘探电法勘探

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Current Status and Future Development of Integrated geophysical Technology in China

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Applied Geophysics 2003年第1期6卷 1-5页

作者： HeZhanxiang BureauofgeophysicalProspecting CNPC

The gap between China''s integrated geophysical technology and the world''s advanced technologies has been significantly narrowed as the result of developments in the last *** new technology has played a very important role in oil and gas exploration in China, especially for the purposes of targeting seismically opaque zones, decreasing exploration risk, and improving exploration efficiency in the western territories and complex areas in China. The current status and future development of non-seismic integrated geophysical teams in China is discussed.

关键词：地球物理学石油天然气探测勘探风险中国西部地区

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An improved fast converted-wave imaging method

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Applied Geophysics 2019年第2期16卷 171-184,253页

作者： Wu Xiao Liu Yang Wang Yong Xu Shi-Gang Jia Wan-Li State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum (Beijing)Beijing 102249China Faculty of Petroleum Karamay Campus of China University of Petroleum (Beijing)KaramayXinjiang 834000China. cnpc Key Laboratory of geophysical Prospecting China University of Petroleum (Beijing)Beijing 102249China. Sinopec geophysical exploration Institute of Jiangsu Oilfi eld Jiangsu210046China.

The conventional fast converted-wave imaging method directly uses backward Pand converted S-wavefield to produce joint images. However, this image is accompanied by strong background noises, because the wavefi elds in all propagation directions contribute to it. Given this issue, we improve the conventional imaging method in the two aspects. First, the amplitude-preserved P-and S-wavef ield are obtained by using an improved space-domain wavef ield separation scheme to decouple the original elastic wavef ield. Second, a convertedwave imaging condition is constructed based on the directional-wavefield separation and only the wavefields propagating in the same directions used for cross-correlation imaging, resulting in effectively eliminating the imaging artifacts of the wavefields with different directions;complex-wavefi eld extrapolation is adopted to decompose the decoupled P-and S-wavefield into directional-wavefields during backward propagation, this improves the eff iciency of the directional-wavef ield separation. Experiments on synthetic data show that the improved method generates more accurate converted-wave images than the conventional one. Moreover, the improved method has application potential in micro-seismic and passive-source exploration due to its source-independent characteristic.

关键词： converted-wave fast imaging elastic wavefield separation directional wavefield separation

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Discovery of the ancient Ordovician oil-bearing karst cave in Liuhuanggou,North Tarim Basin,and its significance

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Science China Earth Sciences 2012年第11期55卷 1406-1426页

作者： ZHONG JianHua MAO Cui LI Yong LI Yang YUAN XiangChun NIU YongBin CHEN Xin HuANG ZhiJuan SHAO ZhuFu WANG PeiJun LI Jia ZHANG DanFeng college of Geoscience and Technology China University of PetroleumQingdao 266580China Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640China Oilfield Department Sinopec GroupBeijing 100825China Institute of exploration and Development Sinopec GroupBeijing 100083China Institute of Resources and Environment college Henan Polytechnic UniversityJiaozuo 454000China BGP geophysical Research Institute CNPCZhuozhou 072751China Institute ofTarim Oilfield CNPCKorla 841000China Graduate University of Chinese Academy of Sciences Beijing 100049China

A typical ancient karst cave is found in the Yijianfang Formation of Ordovician at Liuhuanggou,North Tarim *** an entrance of 4.8 m wide and 20 m high,the Liuhuanggou ancient karst cave extends to NW 315° and has been filled by sediments,which can be classified into three types according to their nature and origin:clastic sediments(gravels),chemical sediments(palaeotravertine),and mixed *** them,the Paleotravertine and gravels are most *** palaeotravertine is laminated type and yellowish brown or black in color due to oil *** saturated with oil,the palaeotravertine is *** microscope,oil mainly accumulates in the cracks between calcite *** filling period of the Liuhuanggou karst cave can be divided into three stages:mixed filling,chemical filling,and clastic(palaeotravertine breccia) *** fractures are distributed on one side of the karst *** fractures can be as wide as 40 cm and over 40 m *** of different periods and sizes constitute a fracture network and are all filled with calcite *** can be found inside the *** the chemical fillings,sulfur is also found,which can indicate the magma influence on karst *** existence of sulfur also confirms that the Liuhunggou karst cave was formed in ancient times rather than recently or *** from normal sedimentary limestone,the ancient Liuhuanggou karst cave has a distinct isotope fractionation and the depletion of heavy carbon and oxygen *** by the northwest oriented vertical strike-slip shear fault,the karst cave is actually a dissolved vertical fault belt.

关键词： ancient karst cave palaeotravertine coated gravels faults oil sulfur Liuhuanggou North Tarim Basin

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Characteristics and Mechanism of Upper Permian Reef Reservoirs in the Eastern Longgang Area, Northeastern Sichuan Basin, China

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Petroleum 2020年第2期6卷 130-137页

作者： Lei Tan Hong Liu Yuzhe Tang Bing Luo Ya Zhang Yuran Yang Yisha Liao Weifeng Du Xiran Yang School of Geosciences and Technology Southwest Petroleum UniversityChengdu610500China Beijing Petroleum Machinery co. CNPC Engineering Technology R&D Company LimitedBeijing102206China The Institute of exploration and Development of Southwest Oil and Gas Field Branch PetroChinaChengdu610059China Chongqing Gas Field Southwest Oil&Gas Field CompanyPetroChinaChongqing400021China Bureau of geophysical Prospecting China National Petroleum corp Zhuozhou072750China Northwest Sichuan Gas Field Southwest Oil&Gas Field CompanyPetroChinaJiangyou621709China

As a typical kind of lithologic reservoirs,reef reservoirs are generally featured by their large single-well reservoir thickness,good reservoir physical properties,and high gas well *** Upper Permian Changxing Formation is an important natural gas exploration target in the Sichuan Basin,which hosts a large reef gas reservoir and is mainly distributed along the Kaijiang-Liangping *** analyses are implemented to investigate reservoir characteristics and identify controlling factors of reef reservoirs in Changxing Formation in the Eastern Longgang Area,Northeastern Sichuan Basin,including core,logging,and seismic data *** Formation reservoirs in the study area mainly occur in the reef-shoal complex,which are featured by wide distribution,large thickness and generally good physical *** rocks are dominantly composed of bioclastic dolomite and silty-fine dolomite(with grain phantom structure),while the main reservoir space consists of residual intergranular pores,intergranular dissolution pores,and karst *** the seismic profiles,typical mound-shaped chaotic reflections can be clearly *** is suggested by the main reservoir development controlling factor analysis that the distributions of reef reservoirs are typically controlled by sedimentary facies belts,while the scale of the reef-shoal complex is determined by the pene-sedimentary *** can not only significantly preserve the primary pores but also enhance the permeability of ***,karstification is the key to high-quality reef-shoal reservoirs.

关键词： Changxing formation Reef Reservoir characteristics Essential factors Eastern longgang

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