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Journal of Earth Science 2012年第4期23卷 431-441页

作者：胡明毅胡忠贵邱小松赵恩璋王丹 Key Laboratory of Exploration Technologies for Oil-Gas Resource of Ministry of Education of Yangtze University School of Geoscience Yangtze University

The changxing （长兴） formation has two sequences （sql and sq2） in the Panlongdong （盘龙洞） Section, Xuanhan （宣汉）, northeastern Sichuan （四川）. It belongs to the platform edge facies belt, rich in reefs and banks, which were developed in the highstand system tract （HST） of sql and sq2, respectively. During third-order relative sea level dropping, the platform edge reef bank were mainly developed in the overall progradation parasequence sets. The platform edge reefs were developed in three phases, while platform edge banks in two phases. Outcrop observation and microscopic identification for platform egde reefs and banks in the section show that the three-phase-reefs are all composed of reef base and reef core, with string of tube sponge as the major reef-building organisms and fiber sponge, hydrazoan and bryozoans as the minor, while the reef-attached organisms mainly being fo- raminifera, brachiopod, echinoderm and ostracod. The first-phase-reef rock type is baffling reefs, the second phase baffling reefs and framework reefs assembles, the third phase framework reefs. Typically, the second phase reefs were developed with the maximum sedimentary scale and thickness, with the most abundant reef-building organisms and reef-attached organisms, showing best physical properties for reservoirs. The platform edge banks mainly consists of gravel debris and ooide grains, mostly dolomized. The dolomitizition in the second phase was relatively intense, favoring good reservoirs.

关键词： northeastern Sichuan changxing formation reef bank depositional model.

Geochemical characteristics of the Permian changxing formation reef dolomites,northeastern Sichuan Basin,China

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Petroleum Science 2013年第1期10卷 38-49页

作者： Hu Zuowei Huang Sijing Li Zhiming Zhang Yingying Xu Ershe Qi Shichao State Key Laboratory of Oil/Gas Reservoir Geology and Exploitation Institute of Sedimentary GeologyChengdu University of Technology Wuxi Research Institute of Petroleum Geology SINOPEC Exploration&Production Institute

The recent discovery of deep and ultra-deep gas reservoirs in the Permian changxing formation reefs, northeastern Sichuan Basin is a significant development in marine carbonate oil ＆ gas exploration in China. Reef dolomites and their origins have been major research topics for sedimentologists and oil ＆ gas geologists. The petrography, trace element and isotope geochemistry of the reef dolomites indicated that the dolomites are characterized by low Sr and Mn contents, relatively low Fe contents, very similar δ13C and 6180 values and very different 87Sr/86Sr ratios. Although the calculated results of the fluid mixing suggested that a mixture with 85%-95% meteoric water and 50/o- 15% seawater seemed to be the dolomitizing fluids of the reef dolomites, the low Mn contents, relatively low Fe contents, high δ13c values and high homogenization temperatures of the dolomites did not support that there were large proportions of meteoric water in the dolomitization process, and the 87Sr/86Sr ratios which were close to coeval seawater also did not support the possibility of the mixture of deep-burial circulated fluids from clastic rocks. High temperature deep-burial circulated seawater with low Mn and Fe contents, high Sr content and high δ13C values from the dissolution of widely distributed Triassic evaporites during the burial diagenetic processes （including dehydration of water-bearing evaporites） could have been the dolomitizing fluids of the reef dolomites.

关键词： Permian changxing formation dolomite reef geochemistry northeastern Sichuan Basin

Geochemical characteristics and diagenetic systems of dolomite reservoirs of the changxing formation in the eastern Sichuan Basin, China

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Petroleum Science 2012年第2期9卷 141-153页

作者： Zhang Bing Zheng Rongcai Wang Xuben Zheng Chao Wen Huaguo Luo Yuan Chi Yuelong State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Engineering Chengdu University of TechnologySichuan 610059China Chongqing Gas Mine PetroChina Southwest Oil and Gasfield CompanyChongqing 401120China Sichuan Science and Technology Worker University Sichuan 610059China

In order to discuss the relationship between dolomite reservoirs and diagenetic systems of the changxing formation, we studied carbon, oxygen and strontium stable isotopes, iron, manganese and strontium trace elements and the Mg/Ca （mol%） ratio, dolomite order degree, and determined that burial dolomitization is the key to controlling the distribution of high quality dolomite reservoir in the changxing formation in the eastern Sichuan Basin. The dolomite of the changxing formation is divided into four diagenetic systems：（1） penecontemporaneous stage syngenetic brine diagenetic system, （2） early diagenetic stage strata seal brine diagenetic system, （3） middle-late diagenetic stage mixed hot brine diagenetic system and （4） tectonic uplift stage mixed hydrothermal fluid diagenetic system. New understanding of the controlling factors and distribution of dolomite reservoir development is discussed. Reef shoal facies belts controlled regional reservoir distribution and the scale of development. Burial dolomitization of a strata seal brine diagenetic system is the foundation of reservoir development, mainly developing pore reservoir. Burial dolomitization of mixed hot brine diagenetic system expanded the reservoir distribution and improved the reservoir quality, mainly developing pore-vug reservoir. Fracturing and dissolution of a mixed hydrothermal fluid diagenetic system is the key to improving the reservoir quality, mainly developing pore-vug-crack complex reservoirs.

关键词： Eastern Sichuan Basin changxing formation dolomite reservoir diagenesis geochemical characteristics diagenetic system

Reef Types and Sedimentation Characteristics of changxing formation in Manyue-Honghua Section of Kaixian,Northeastern Sichuan Basin

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Journal of Earth Science 2012年第4期23卷 490-505页

作者：吴立群焦养泉荣辉王瑞李荣 Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of Geosciences Faculty of Earth Resources China University of Geosciences College of Geosciences China University of Petroleum Department of Earth and Atmospheric Sciences University of Alberta

In changxing （长兴） stage, Manyue （满月）-Honghua （红花） Section of Kaixian （开县）, northeastern Sichuan （四川） Province was located in the platform-margin slope, which was the advantage area of reef-shoal depositional system developing. The strata of changxing formation are continuously exposed on both Honghua Section and Manyue Section. Four and two depositional cycles ean be identified in Honghua Section and Manyue Section, respectively. They are all platform-margin reef-shoal deposits. Their lithologic associations have obvious sequence, which is as follows： micrite bioclast limestone, bafflestone, bindstone, framestone, and bioclast limestone, in order from below. The paleontological assemblages are controlled by water depth and genetic facies. Six paleontological as- semblages can be identified in Honghua Section and Manyue Section; they are coral-calcareous algaecalcareous sponge assemblage, calcareous sponge-calcareous algae assemblage, calcareous spongecalcareous algae-coral-bryozoan assemblage, calcareous sponge-calcareous algae-hydra assemblage, calcareous sponge-calcareous algae-hydra-bryozoan assemblage, and calcareous sponge-calcareous algae-hydra-bryozoan-coral assemblage. The study of lithologic associations and paleontological assemblages indicates that the water body shallowed upward in both the growth cycle of a single reef and the higher-grade depositional cycle. According to the water depth types of reef （bioherm） developing, three different reef-shoal depositional systems can be identified in study area： deep-water-type bioherm, transitional-type reef （bioherm）, and more shallow-water-type reef.

关键词： northeastern Sichuan Manyue-Honghua Section changxing formation reef.

Effects of Intracratonic Strike-slip Fault on the Differentiation of Carbonate Microfacies: A Case Study of a Permian Platform Margin in the Sichuan Basin(SW China)

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Acta Geologica Sinica(English Edition) 2024年第4期98卷 936-954页

作者： LIU Jiawei WU Guanghui TANG Qingsong WU Yonghong ZHANG Wenjin ZHAO Zhongyu School of Geoscience and Technology Southwest Petroleum UniversityChengdu 610500China Qiangtang Basin Research Institute Southwest Petroleum UniversityChengdu 610500China Southwest Petroleum University Division of Key Laboratory of Carbonate Reservoirs of CNPCChengdu 610500China PetroChina Southwest Oil&Gasfield Company Chengdu 610051China

In intracratnoic basins, the effect of strike-slip faults on sedimentary microfacies is generally underestimated due to their small scale. Based on the integration of core, well logs, and three-dimensional seismic data, this study presents a comprehensive analysis of the Permian carbonate platform and strike-slip faults in the southwestern Kaijiang-Liangping trough of the Sichuan Basin. The relationship between strike-slip faults and Permian carbonate microfacies is investigated. The results reveals the existence of a NW-trending strike-slip fault zone along the platform margin, exhibiting clear segmentation. The western side of the study area exhibits a rimmed platform margin characterized by type I reefs, which corresponds to the presence of a large-scale strike-slip fault zone. In contrast, the eastern side is characterized by a norimmed and weak rimmed platform margin, accompanied by type II reefs, which align with smaller strike-slip fault zones. It was found that the strike-slip fault had some effects on the platform and reef-shoal complex of the Permain changxing formation. First, the platform was divided by strike-slip fault into three segments to show rimmed, week rimmed and norimmed platform. Second, reef-shoal complex devolped along the faulted high position in the strike-slip fault zone, and separated by faulted depression. Third, strike-slip faults can offset or migrated the reef-shoal complex and platform margin. Additionally, the thickness of the platform margin varies across strike-slip fault zone, which is related to the activity of strike-slip faults. The strike-slip faults affect the microfacies by controlling the pre-depositional paleotopography. This case suggests that the strike-slip faults play a crucial role in the diversity and distribution of carbonate microfacies in the intracratonic basin.

关键词： strike-slip faults segmentation carbonate platform sediment dispersal pattern changxing formation Kaijiang–Liangping trough Sichuan Basin

New Seismic Attribute Technology for Predicting Dissolved Pore-Fracture of Deeply Buried Platform Margin Reef-Beach System in Northeast Sichuan Basin, China

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Journal of Earth Science 2015年第3期26卷 373-383页

作者： Chao Wang Yongchao Lu Hongguang Huang Fengcun Xing Lei Chen Xuebin Du Zhanhong Liu Wenjun Zhang Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of Geosciences Faculty of Earth Resource China University of Geosciences Administrative Department CNOOC Zhanjiang Branch Company Institute of Sedimentary Geology Chengdu University of Technology State Key Laboratory of Oil/Gas Reservoir Geology and Exploitation Chengdu University of Technology SINOPEC Exploration Southern Company

The large reef complexes of the Upper Permian changxing formation, with a significant breakthrough for petroleum exploration, are an important target for petroleum exploration in the Yuanba area of the Sichuan Basin in SW China. The storage space types of reef complexes are dominated by the dissolved pore-fracture（DPF）. However, using only single geophysical methods, it is difficult to predict effective distribution of DPF. Based on a combination of geological models and geophysics technology, this study proposes two new geophysical methods, including anisotropy coherence technique（ACT） and fracture intensity inversion（FII）, to research the characteristics of DPF by faciescontrolling in changxing formation in Yuanba area. Two major findings are presented as follows：（1） the characteristics of DPF varying with facies are the result of different diagenetic and petrophysical property. The intensity of DPF decreases from reef and bioclastic bank to interbank sea and slope;（2） ACT can qualitatively identify the distribution of DPF with no-directional and dispersed distribution, while FII can quantitatively characterize the intensity of DPF development within various sedimentary facies. When integrated into the geological study, ACT and FII can provide an effective way to predict the distribution of DPF in similar geological settings and the predicted DPF have been supported by the historical well data.

关键词： dissolved pore fracture reef-beach system seismic attribute changxing formation Yuanba area Northeast Sichuan Basin

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