摘要
综合钻井、测井及地震资料分析,进一步明确川西南地区下寒武统龙王庙期发育两期局限台地鲕粒、砂屑浅滩,平面上以资阳—磨溪地区为浅滩发育的中心,向四周减薄,纵向上由中心区稳定的早、晚两期浅滩迁移演变为边缘的晚期滩。储层岩性为溶孔微晶-细晶白云岩、滩相砂屑白云岩、鲕粒白云岩,储集空间以粒间溶孔、粒内溶孔、晶间溶孔为主,资阳—磨溪地区为中低孔渗—高孔渗,测井表现为低伽马、低电阻、低密度、较高的声波时差,为孔隙型储层;白云石化是形成储层的基本条件,溶蚀作用对优质储层发育起决定性作用。资阳—磨溪地区储层厚度为30~50m,孔隙度为4%~6%,发育最好;向南西、南方向储层厚度变为10~30m,孔隙度为3%~4%,因此,资阳-磨溪地区是龙王庙组油气勘探的最有利区。
The comprehensive analysis of drilling,logging and seismic data further makes it clear that there develop two stages restricted platform oolite,sandy beach in Lower Cambrian Longwangmiao Formation of Southwest Sichuan.On the plane,the Ziyang-Moxi area is the development center of beach,thinning to the surroundings and vertically,the early and late stage stable banks in the central area transfer and evolve into the late beach on the edge.The reservoir rocks are the dissolved pore micro-fine crystalline dolomite,beach facies psammitic dolomite,and oolite dolomite,and the reservoir spaces are dominated by the intergranular dissolved pore,intragranular dissolved pore,and intergranular dissolved pore.The physical properties of the reservoir in Ziyang-Moxi area are the middle and low porosity and permeability and the high porosity and permeability.Logging shows as low gamma,low resistance,low density,high sonic time difference,so the reservoir belongs to poretype reservoir.Dolomitization is the basic condition to form a reservoir,and the corrosion playsadecisive role in the high-quality reservoir development.In the Ziyang-Moxi area,the reservoir thickness is 30~50 m,the porosity is 4% ~6%,and the reservoir develops the best.To the southwest and the south,the reservoir thickness is 10~30 m,and the porosity is 3% ~4%.Therefore,the Ziyang-Moxi area is the most favorable oil and gas exploration area in the Lower Cambrian Longwangmiao Formation.
引文
[1]黄文明,刘树根,王国芝,等.四川盆地下古生界油气地质条件及气藏特征[J].天然气地球科学,2011,22(3):465-476.Huang W M,Liu S G,Wang G Z,et al.Geological conditions and gas reservoir features in Lower Paleozoic in Sichuan Basin[J].Natural Gas Geoscience,2011,22(3):465-476.(In Chinese)
[2]姚建军,陈孟晋,华爱刚,等.川中乐山—龙女寺古隆起震旦系天然气成藏条件分析[J].石油勘探与开发,2003,30(7):7-9.Yao J J,Chen M J,Hua A G,et al.Formation of the gas reservoirs of the Leshan-Longnvsi Sinian palaeo-uplift in central Sichuan[J].Petroleum Exploration and Development,2003,30(7):7-9.(In Chinese)
[3]孙玮,刘树根,王国芝,等.四川威远震旦系与下古生界天然气成藏特征[J].成都理工大学学报:自然科学版,2010,37(5):481-489.Shun W,Liu S G,Wang G Z,et al.Characteristics of gas formatted from Sinian to Lower Paleozoic in Weiyuan area of Sichuan Basin,China[J].Journal of Chengdu University of Technology(Science&Technology Edition),2010,37(5):481-489.(In Chinese)
[4]李兴平,孟宪武,王海军,等.川西南地区海相成藏条件与目标评价[R].贵阳:中国石化西南油气分公司勘探开发研究院,2013.Li X P,Meng X W,Wang H J,et al.Marine accumulation conditions and target evaluation in the southwest area of Sichuan[R].Guiyang:Exploration and Development Research Institute,Southwest Oil Gas Branch Company of SINOPEC,2013.(In Chinese)
[5]李伟,余华琪,邓鸿斌.四川盆地中南部寒武系地层划分对比与沉积演化特征[J].石油勘探与开发,2012,39(6):681-690.Li W,Yu H Q,Deng H B.Stratigraphic division and correlation and sedimentary characteristics of the Cambrian in central-southern Sichuan Basin[J].Petroleum Exploration and Development,2012,39(6):681-690.(In Chinese)
[6]陈学时.皖南寒武一奥陶系白云岩类型及成因探讨[J].石油勘探与开发,1992,19(1):14-21.Chen X S.Types and origins of Cambrian-Ordovician dolomite in southern Anhui[J].Petroleum Exploration and Development,1992,19(1):14-21.(In Chinese)
[7]李天生.四川盆地寒武系沉积成岩特征与油气储集性[J].矿物岩石,1992,12(3):68-72.Li T S.The characteristics of sedimentary rock and reservoir of oil and gas of Cambrian system in Sichuan Basin[J].Journal of Mineralogy and Petrology,1992,12(3):68-72.(In Chinese)
[8]孙健,董兆雄,郑琴.白云岩成因的研究现状及相关发展趋势[J].海相油气地质,2005,10(3):25-30.Shun J,Dong Z X,Zheng Q.Research status of dolomite genesis and development trend[J].Marine Origin Petroleum Geology,2005,10(3):25-30.(In Chinese)
[9]胡明毅.湖南石门中上寒武统白云岩成因[J].石油与天然气地质,1993,14(2):153-160.Hu M Y.In the Upper Cambrian dolomite genesis of Hunan Shimen[J].Oil&Gas Geology,1993,14(2):153-160.(In Chinese)
[10]叶德胜.海相碳酸盐岩原始氧碳同位素组分随地质历史的变化[J].岩相古地理,1992(2):51-56.Ye D S.The original oxygen and carbon isotope composition along with the change of geological history in marine carbonate rocks[J].Sedimentary Facies and Palaeogeography,1992(2):51-56.(In Chinese)
[11]曾理,万茂霞,彭英.白云石有序度及其在石油地质中的应用[J].天然气勘探与开发,2004,27(4):64-66.Zeng L,Wan M X,Peng Y.Dolomite sequentiality and its application to petroleum geology[J].Natural Gas Exploration and Development,2004,27(4):64-66.(In Chinese)
[12]黄思静.四川渠县龙门峡三叠系嘉陵江组第三、四段白云石有序度及其形成条件探讨[J].矿物岩石,1985,5(4):57-62.Huang S J.The degree of order and forming conditions of the dolomite of the third and fourth members of Lower Triassic Jialingjiang Formation in Longmenxia,Quxian,Sichuan[J].Journal of Mineralogy and Petrology,1985,5(4):57-62.(In Chinese)
[13]钟倩倩,黄思静,邹明亮,等.碳酸盐岩中白云石有序度的控制因素[J].岩性油气藏,2009,21(3):50-54.Zhong Q Q,Huang S J,Zhou M L,et al.Controlling factors of order degree of dolomite in carbonate rocks[J].Lithologic Reservoirs,2009,21(3):50-54.(In Chinese)
[14]牛晓燕,李建明,李冬冬.中扬子西部地区石龙洞组古岩溶储层控制因素分析[J].石油仪器,2010,24(2):69-72.Niu X Y,Li J M,Li D D.Analysis of Shilongdong Formation of ancient karst reservoir control factors in the Naka Ko West[J].Petroleum Instruments,2010,24(2):69-72.(In Chinese)