乌石凹陷流沙港组二段有利储层发育控制因素
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摘要
为了明确北部湾盆地乌石凹陷流沙港组二段有利储层发育主控因素,基于铸体薄片、常规物性、测井解释等资料,分析了流沙港组二段储层岩石组分、成岩强度、孔喉结构等特征,指出了有利储层分布与油气勘探方向。研究结果表明:①流沙港组二段北部缓坡—东北部中央反转构造带储层较南部陡坡带—凹陷中心储层压实弱、喉道粗、粒间孔发育,南部陡坡带西段储层较东段储层压实弱、不稳定组分含量高、次生孔发育;②流沙港组二段有利储层主要受沉积环境与沉积水动力造成的粒度及泥质杂基、古地温场造成的压实强度的控制,局部受岩石组分差异与通源断裂控制的有机酸溶解和相对早期油气充注保护的影响;③流沙港组二段三角洲沉积、中等压实区的北部缓坡—东北部中央反转构造带最有利,次为较低古地温场的南部陡坡带西段中等—强溶蚀扇体,W6构造和W8构造为两个有利勘探方向。结论认为,该研究成果为区带目标优选与评价提供了支撑,并得到了钻探证实。
In order to determine the factors controlling the development of favorable reservoirs of the second Member of Liushagang Formation in the Wushi Sag of Beibu Gulf Basin, the rock compositions, diagenetic intensity,pore-throat structure and other characteristics of the reservoir of the second Member of Liushagang Formation were analyzed with the casting thin section, conventional physical property and logging interpretation data as the research objects. In addition, the distribution and exploration direction of favorable reservoirs were pointed out. And the following research results were obtained. First, compared with the reservoir in the steep slope belt-sag center in the southern area, the reservoir of the second Member of Liushagang Formation in the gentle slope of northern area and the central inversion structure belt of northeastern area is weaker in compaction, larger in throat sizes and more developed in intergranular pores. And the reservoir in the western section of the steep belt in the southern area is weaker in compaction, higher in the content of unstable compositions and more developed in secondary pores than that in the eastern section. Second, the favorable reservoirs of the second Member of Liushagang Formation are controlled by the particle sized dominated by sedimentary environment and sedimentary hydrodynamics, the shale matrix and the compaction strength caused by palaeogeothermal field, and locally affected by the organic acid dissolution controlled by rock compositional difference and source connecting fault and the earlier hydrocarbon charging preservation. Third,the most favorable zone is the gentle slope in the north and the central inversion structure belt in the northeast in the moderate compaction of delta sedimentary facies of the second Member of Liushagang Formation, which is followed by the moderate-strong dissolution fan in the western section of steep slope in the southern area of lower palaeogeothermal field, and W6 and W8 structures are two favorable exploration directions. It is indicated that the cognitions provide the support for the zonal target selection and evaluation and are verified in actual drilling.
In order to determine the factors controlling the development of favorable reservoirs of the second Member of Liushagang Formation in the Wushi Sag of Beibu Gulf Basin, the rock compositions, diagenetic intensity,pore-throat structure and other characteristics of the reservoir of the second Member of Liushagang Formation were analyzed with the casting thin section, conventional physical property and logging interpretation data as the research objects. In addition, the distribution and exploration direction of favorable reservoirs were pointed out. And the following research results were obtained. First, compared with the reservoir in the steep slope belt-sag center in the southern area, the reservoir of the second Member of Liushagang Formation in the gentle slope of northern area and the central inversion structure belt of northeastern area is weaker in compaction, larger in throat sizes and more developed in intergranular pores. And the reservoir in the western section of the steep belt in the southern area is weaker in compaction, higher in the content of unstable compositions and more developed in secondary pores than that in the eastern section. Second, the favorable reservoirs of the second Member of Liushagang Formation are controlled by the particle sized dominated by sedimentary environment and sedimentary hydrodynamics, the shale matrix and the compaction strength caused by palaeogeothermal field, and locally affected by the organic acid dissolution controlled by rock compositional difference and source connecting fault and the earlier hydrocarbon charging preservation. Third,the most favorable zone is the gentle slope in the north and the central inversion structure belt in the northeast in the moderate compaction of delta sedimentary facies of the second Member of Liushagang Formation, which is followed by the moderate-strong dissolution fan in the western section of steep slope in the southern area of lower palaeogeothermal field, and W6 and W8 structures are two favorable exploration directions. It is indicated that the cognitions provide the support for the zonal target selection and evaluation and are verified in actual drilling.
引文
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[2]胡望水,吴婵,梁建设,等.北部湾盆地构造迁移特征及对油气成藏的影响[J].石油与天然气地质,2011,32(6):920-927.Hu Wangshui,Wu Chan,Liang Jianshe,et al.Tectonic transport characteristics and their influences on hydrocarbon accumulation in Beibuwan Basin.Oil&Gas Geology,2011,32(6):920-927.
[3]尤丽,招湛杰,吴仕玖,等.北部湾盆地乌石凹陷流一段储层物性主控因素研究[J].天然气技术与经济,2018,12(2):6-10.You Li,Zhao Zhanjie,Wu Shijiu,et al.Study on the main controlling factors of reservoir physical property of the 1rd member of Liushagang Formation in Wushi Sag,Beibu Gulf Basin[J].Natural Gas Technology and Economy,2018,12(2):6-10.
[4]杨海长,赵志刚,李建红,等.乌石凹陷油气地质特征与潜在勘探领域分析[J].中国海上油气,2009,24(1):227-231.Yang Haizhang,Zhao Zhigang,Li Jianhong,et al.An analysis of petroleum geology and potential exploration targets in Wushi sag[J].China Offshore Oil and Gas,2009,24(1):227-231.
[5]孙伟,樊太亮,赵志刚,等.乌石凹陷古近系层序地层及沉积体系[J].天然气工业,2008,28(4):26-28.Sun Wei,Fan Tailiang,Zhao Zhigang,et al.Paleogene sequence stratigraphy and sedimentary system in Wushi Sag[J].Natural Gas Industry,2008,28(4):26-28.
[6]柳广弟.石油地质学[M].北京:石油工业出版社,2009.Liu Guangdi.Petroleum Geology[M].Beijing:Petroleum Industry Press,2009.
[7]兰叶芳,黄思静,吕杰.储层砂岩中自生绿泥石对孔隙结构的影响--来自鄂尔多斯盆地上三叠统延长组的研究结果[J].地质通报,2011,30(1):134-140.Lan Yefang,Huang Sijing,Lv Jie.Influences of authigenic chlorite on pore structure in sandstone reservoir:A case study from Upper Triassic Yanchang Formation in Ordos basin,China[J].Geological Bulletin of China,2011,30(1):134-140.
[8]刘玉虎,李瑞磊,洪伟,等.深大断裂特征及其对天然气成藏的影响--以松辽盆地德惠断陷万金塔地区为例[J].天然气勘探与开发,2017,40(1):23-31.Liu Yuhu,Li Ruilei,Hong Wei,et al.Characteristics of deep large fault and its effects on gas accumulation:A case study on Wanjinta area in Dehui fault depression of the Songliao Basin[J].Natural Gas Exploration and Development,2017,40(1):23-31.
[9]蒋凌志,牛嘉玉,张庆昌,等.渤海湾盆地深部有利储层发育的主控因素[J].地质论评,2009,55(1):73-78.Jiang Lingzhi,Niu Jiayu,Zhang Qingchang,et al.Major Factors Analysis on Controlling the Formation of Favorable Reservoir in Deep Level of Bohai Bay Basin[J].Geological Review,2009,55(1):73-78.
[10]Marchand A M E,Small ey P C,Haseldine R S,et al.Note on the importance of hydrocarbon fill for reservoir quality prediction in sandstones[J].AAPG Bulletin,2002,86(9):1 561-1 571.
[11]Walderhaug O.Modeling quartz cementation and porosity in middle Jurassic Brent group sandstones of the Kvitebjorn field,northern North Sea[J].AAPG Bulletin,2000,84(9):1 325-1 339.
[12]柳永杰,赵志刚,李建红,等.乌石凹陷成藏组合划分及主控因素分析[J].中国海上油气,2008,20(2):82-86.Liu Yongjie,Zhao Zhigang,Li Jianhong,et al.Hydrocarbon play division and major controlanalysis in Wushi sag,Beibuwan basin[J].China Offshore Oil and Gas,2008,20(2):82-86.
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