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川东地区相东区块石炭系储层特征及有利区预测
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摘要
论文以碳酸盐岩沉积学原理与方法,结合区域沉积背景、地层岩石学特征分析、镜下薄片观察等多手段,对相东区块石炭系沉积环境、沉积微相展布特征进行研究。以石油地质学理论、储层地质学原理、测井学方法为指导,分析研究区石炭系储层特征以及空间展布特点,剖析石炭系储层发育的主控因素,对各井储层发育级别进行综合评判,并以此为基础对储层发育的有利区进行预测。论文取得的主要成果和认识如下:
     (1)相东区块石炭系黄龙组,岩性以白云岩、角砾白云岩及角砾灰岩为主,整个石炭系黄龙组钻厚一般17~18m,唯相21井相对较薄,为13.8m,石炭系主要发育C_2hl~2、C_2hl~1,仅相19井发育有C_2hl~3。各层段在岩性、电性上均有明显差异。
     (2)在分析相东区块石炭系新解释的构造图的基础上,对相东区块构造进行详细解剖,描述了该区块的构造造特征与断层特征、圈闭特征。
     (3)采用“蒸发膏湖—泻湖—正常陆表海碳酸盐岩沉积模式”分析、解释研究区沉积环境。进行单井沉积微相划分并绘制了研究区石炭系黄龙组各段的沉积微相平面展布图,认为有利沉积相带为泻湖内浅滩微相。
     (4)相东区块石炭系气藏为裂缝~孔隙型气藏,储层以Ⅲ类为主,发育少量Ⅱ类,未见Ⅰ类储层。主要储集空间有粒间溶孔、粒内溶孔、晶间溶孔,裂缝主要为小的水平缝。相东区块石炭系储层孔隙度、渗透率均比相国寺主体构造差,Ⅱ类储层构成了相东区块石炭系黄龙组的优质储层。
     (5)对研究区裂缝发育特征进行了精细描述与统计,认为相东区块裂缝以构造缝为主,主要集中于C_2hl~2段。平面上,裂缝主要发育在断层附近,相17井、相21井及相27井是裂缝发育的井。
     (6)在储层级别划分的基础上绘制了石炭系储层连井对比图及储层展布平面图。从这些图件可以发现,相东区块储层不甚发育,储层厚度较小,且各井储层分布不均,储层厚度变化较大。
     (7)剖析了相东区块石炭系储层发育的主控因素,对各井石炭系储层进行综合评判与打分;综合整个研究成果,预测储层发育的有利区域。研究认为,相27井区及邻近区域和相32井、相21井、相9井区及邻近区域是石炭系储层发育的有利区域。
Regional sedimentary framework、petrology characteristic、slice observation are used to research of sedimentary environment and mutil-factor sedimentary microfacies of carboniferous carbonate rocks in Xiangdong area in this thesis ,as a guidance with principles of sedimentology of carbonatite ;As a guidance with petroleum geology , reservoir geology and geophysics , in order to analyses the characteristic of reservoir of carboniferous and its distribution discipline in area ; analyses the master control factor of reservoir and comprehensive sentenced to general the rank of reservoir of the well. On this condition , forecast the favourable region of Carboniferous reservoir . This thesis acquires the following main outcomes are as follows:
     (1) Dolomite, dust dolomite and dust limestone are primitive type of rock type of carboniferous, Huanglong formation, in Xiangdong area . The thickness of Huanglong formation between17m and 18m ,except the well of Xiang 21 whose carboniferous thickness only 13.8m. The Huanglong formation has three segments, only the well of Xiang 19 has the third segment. Each segment has its own lithology and electrical property characteristic.
     (2) The thesis analysed the new constructional drawing of carboniferous of Xiangdong area first, detailed studies the characteristics of its structure , faults、and traps.
     (3) Analysed and explained the environment of sedimentation of researched area by the mode of“evaporation anointed lake– lagoon–normal epicontinental sea of carbonatite depositional model”. Analysed the microfacies of wells and drawing the microfacies plan of Huanglong formation. It is found that the shoal in lagoon is the best advantageous microfacies.
     (4) The carboniferous gas reservoir’s type is fracture porosity reservoir. The carboniferous reservoir mainly growingⅢkind, lessⅡkind . The main gathering space are intergranular corrosion pore, intragranular corrosion pore, intercrystal corrosion pore; fissure majority is small horizontal fracture. The porosity and permeability in Xiangdong area is inferior to Xiangguoshi. The reservoir ofⅡkind is high grade reservoir in researched area.
     (5) By fine descriping and statisticing crack growth character, the research thought that the main type of fracture is structural, on longitudinal mainly concentrates in the C_2hl~2 section. On crosswise grows nearby the big fracture as well as the minor fracture, the main growth fracture region nearby Xiang 17 well, Xiang 21 well and Xiang 27 well.
     (6) The thesis divided the Carboniferous reservoir first, then drawing the Carboniferous reservoir well tie contrast and the aerosphere distribution sectional drawings of Carboniferous reservoir; Carboniferous reservoir spread plan. From these drawings, Carboniferous reservoir in researched area do not growth many Carboniferous reservoirs. The thickness of Carboniferous reservoir is thin and maldistribution in wells .
     (7) Analysed the governing factor of Carboniferous reservoir in researched area ; give the grade to each well and synthesized the research achievement to forecast favourable region of Carboniferous reservoir. By the research, Xiang 17 well, Xiang 21 well, Xiang 27 well and nearby area is the favourable region .
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