Fig. 1 Depositonal sequence of Xujiahe Formation 1 37% ~ 83% % 1% ~ 15% 8. 95% 13% ~ 62. 5% % 5% ~ 43% % 3% ~ 20% 9.

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1 ACTA SEDIMENTOLOGICA SINICA Vol. 28 No. 1 Feb zhangxx_77@ sina. com TE A Jennings R H 11 1 ~ 3 Grigsby J % 70% 4 South Texas Mcallen Ranch Vicksburg Mathisen M E 13 Oklahoma Simpson 6 ~ A

2 Fig. 1 Depositonal sequence of Xujiahe Formation 1 37% ~ 83% % 1% ~ 15% 8. 95% 13% ~ 62. 5% % 5% ~ 43% % 3% ~ 20% 9. 7% 0 ~ 16% ~ μm % ~ 6% 6% μm 2 50% ~ 69% % % ~ 16% ~

3 52 28 μm 2 2-D 2-A B 2 6% ~ μm 2 45% ~ 65% 57. 5% 6% < < 10% ~ μm 2 60% ~ 78% 68. 2% 2-C 3 6% 2-E 40% ~ 63% 53. 2% ~ % ~ 8% 3% 3% ~ 6% ~ % ~ 33% 23. 8% μm 2 Table Reservoir pore parametersying Fengxiang 2004 /MPa /μm Ⅰ < 0. 1 > 10 > 100 Ⅱ 0. 1 ~ ~ ~ 100 Ⅲ 0. 5 ~ ~ ~ 50 Ⅳ 1. 0 ~ ~ ~ 20 Ⅳ > 2. 0 < 0. 5 < 10 /μm /10-3 μm 2 > ~ ~ ~ 15 5 ~ 10 > ~ ~ ~ 100 < 10 A mb mc md me mf m 2 Fig. 2 Diagenetic facies types of the forth memberxujiaohe FormationGuangan area

4 % 32 ~ 28% 16. 3% < 1% < μm 2 2-F Table 2 3 Fig. 3 Diagenetic facies logging characteristics of the forth memberxujiahe Formation 2 Diagenetic facies logging characteristics of the forth memberxujiahe FormationGuangan area /API /Ω M < 70 < 10 < 80 < 20 > 60 > 20 < 60 > 30 < 60 > 50 /μs /ft > 65 > 65 < 65 < 65 < 65 /g /m 3 < 2. 5 < 2. 5 > 2. 5 < 2. 5 > 2. 5 /% > 10 > 6 < 10 < 6 < 6 < 3

5 54 28 Fig Diagenetic facies analysis of the forth memberxujiahe FormationWell 101Guangan

6 1 55 Fig. 5 5 Thickness percentage content contour diagrams and thickness content contour diagrams of Xu 4 Sub-MemberGuangan area % 7. 5 m 5 < 30% 40% 126 > 70% > 25 m m % 20% 7. 5 m > 30% 15 m

7 56 28 Fig. 6 6 Diagenetic distribution map of of Xu 4 Sub-MemberGuangan area low grade resource J References J Zou Caineng Tao ShizhenGu Zhidong. Formation conditions and distribution result of large lithologic oil-gas fields with low abundance in China J. Acta Geological Sinica J Zha QuanhengHe Wenyuan. A primary discussion on the. Petroleum Exploration and Development J Tian ChangbingYu XingheXu Annaet al. Geological characteristics and origin peculiarities of low efficiency gas reservoirs in China J. Experimental Petroleum Geology M. 2007Wang Daofu. Extremely Low Permeability Oil Field Development Ordos BasinM. BeijingPetroleum Industry Press Bjorlykke K. Formation of secondary porosityhow important is it C Mcdonald D A. Surdam R C. Clastic DiagenesisAAPG Memoir J Zou CainengTao Shizhen Zhou Huiet al. Genesisclassification and evaluation method of dia- 1. genetic facies J. Petroleum Exploration and Development

8 from the Lower Vicksburg Formation McAllen Ranch field south Tex- 7. as J. AAPG Bulletin J Zhu Xiaomin Dong YanleiGuo Changmin. Sequence framework and reservoir quality of Sha I Member in Shahejie FormationQikou sag J. Acta Sedimentologica Sinica J Zhu Guohua. Origin and evolution and prediction of porosity in clastic reservoir rocks J. Acta Sedimentologica Sinica J Chen Yanhua. Digenetic faciesa new approach to the prediction of reservoir rocks J. Experimental Petroleum Geology J. reservoir rocksj. Journal of the University of Petroleum China Zou CainengTao ShizhenXue Shuhao. Connotation of Facies Control Theory and its significance for explorationj. Petroleum Exploration and Development Jennings R H Mazzullo J M. Shallow Burial Diagenesis of Chalks and Related Sediments at DSDP leg 80site 550 on the Goban Spur. Initial Reports of the Deep Sea Drilling Project M. US Government printing Office Washington D C Grigsby J D Langsford R P. Effects of diagenesis on enhanced-resolution bulk density logs in Tertiary Gulf Coast sandstonesan example 13 Mathisen M E. Controls of quartzarenite diagenesis Simpson Group O- klahomaimplications for reservoir quality predictionc Johnson K Sed. Simpson and Viola Groups in the Southern Midcontinent. Oklahoma Geological Survey Circular 1997 M. 2004Ying FengxiangLuo PingHe Dongbo et al. Clastic Rock Reservoirs Diagenesis and Nnumerical Simulation of Oil and Gas-bearing Basin in ChinaM. BeijingPetroleum Industry Press J Zhao ChenglinLiu Menghui. Study on micro-sedimentary facies and diagenesis of clastic Suppl J Zhong Guangfa. Diagenetic lithofacies analysis and its application in sandstone reservoirs of Biyang depression J. Journal of Jianghan Petroleum Institute M. 1989Zheng JunmaoPang Ming. Diagenesis Research of Clastic ReservoirsM. WuhanChina University of Geoscience Press1989 Diagenetic Facies Types and Semiquantitative Evaluation of Low Porosity and Permeability Sandstones of the Fourth Member Xujiahe Formation Guangan AreaSichuan Basin ZHANG Xiang-xiang 1 ZOU Cai-neng 1 TAO Shi-zhen 1 XU Chun-chun 2 SONG Jian-rong 2 LI Guo-hui 2 1. Research Institute of Petroleum Exploration & DevelopmentPetroChinaBeijing Southwest Oil & Gas Field Branch CompanyPetroChinaChengdu Abstract Diagenetic facies are results of diagenetic evolutions under special depositionl and diagenetic environments including grainscementsand textures integrated features. The study of diagenetic facies is important to low porosity and permeability sandstones in current exploration phases. This paper divided forth member of Xujiahe system of Guangan region into five diagenetic typesand set up the logging characteristics of each diagenetic facies. After single wells diagenetic facies analysis this paper has semiquantitatively evaluated forth member of Xujiahe Formation of Guangan area by authorizing thickenss percentage content contour diagrams thickenss content contour diagramsareal distribution graph of diagenetic facies. Key words Xujiahe Formation diagenetic faciesdiagenesissemiquantitative evaluationlow porosity and permeability sandstones

4 731 Table TOC > 2% Log characteristics of different types of organic rich source rocks in Well FS2 /m TOC /% GR /API AC / μs /ft CNL /% DEN /

4 731 Table TOC > 2% Log characteristics of different types of organic rich source rocks in Well FS2 /m TOC /% GR /API AC / μs /ft CNL /% DEN / 31 4 2013 8 ACTA SEDIMENTOLOGICA SINICA Vol. 31 No. 4 Aug. 2013 1000-0550 2013 04-0730-08 1 257015 TOC AC LogRt DEN TOC DEN LogRt ΔGR TOC S 1 + S 2 TOC TOC S 1 + S 2 TOC TOC 1982 E-mail swap124@ 163. com