米仓山前缘震旦系灯影组油气前景探讨

发布时间：2018-07-25 08:34

【摘要】：米仓山前缘地区震旦系灯影组是油气勘探的重要层位,本文以天星1井和南江杨坝剖面为重点,结合前人研究资料,分析米仓山前缘地区震旦系灯影组烃源岩发育特征、储层发育特征、沥青发育特征和油气保存条件,探讨米仓山前缘地区震旦系灯影组油气勘探前景。米仓山前缘地区下寒武统筇竹寺组是震旦系灯影组的主力烃源岩,为陆棚沉积环境下的黑色炭质页岩、粉砂质泥岩夹泥质粉砂岩,有机质类型为I型,处于过成熟阶段,镜质体反射率呈现东高西低的分布特征,东南缘贵民和楠木树地区最高(Ro3.0%),西南缘青竹园和杨坝地区最低(Ro1.5%)。有机质丰度较低(天星1井平均值为1.21%,杨坝剖面平均值2.34%),呈现出北高南低,从山到盆逐渐减小,沿米仓山基底隆起周缘从东西两侧向中部逐渐减小的分布特征。有效烃源岩厚度大(天星1井厚269m,杨坝剖面厚173m),呈现出西北厚东南薄的分布特征。整体上米仓山基底隆起西南缘天星1井地区烃源岩发育最好,南江桥亭、贵民地区其次。米仓山前缘地区震旦系灯影组储层主要发育在灯影组2段和灯影组4段。灯影组2段岩性主要为葡萄石白云岩、含砾屑砂屑白云岩、纹层状白云岩、藻团粒白云岩、叠层石白云岩和硅质白云岩。孔隙空间类型为晶间(微)孔、溶蚀孔、裂缝和顺层发育的溶洞,形成晶间(微)孔—溶蚀孔—裂缝型和溶孔溶洞型储集空间组合类型;灯影组4段岩性主要为砂屑白云岩、叠层石白云岩、纹层状白云岩、凝块石白云岩和微晶白云岩。孔隙空间类型为晶间(微)孔、粒间孔、溶蚀孔、格架孔和构造破裂缝,形成晶间(微)孔—粒间孔—溶蚀孔—裂缝型储集空间组合类型,储集空间以构造破裂缝为主。储层物性较低,孔渗相关系数小,储层类型为裂缝型、孔隙—裂缝型。纵向上,灯影组4段储层为更好的有利储层段。横向上,米仓山基底隆起西南缘天星1井地区为研究区较好的储层发育区。米仓山前缘地区震旦系灯影组储层沥青普遍发育。纵向上,沥青主要发育于灯影组4段,灯影组2段仅顶部发育少量沥青,且含量明显少于灯影组4段,具有明显的上部层段连续集中、充填率高、向下逐步分散发育、充填率低的特点。灯影组4段沥青主要发育在顶部0~80m范围内,其次为中部距顶90~220m,底部发育最差;横向上,沥青含量分布整体呈现围绕米仓山基底隆起向四周逐渐减少的变化趋势。米仓山前缘地区盖层发育齐全,主要包括下寒武系筇竹寺组泥岩、下志留统龙马溪组泥岩、下—中三叠统雷口坡组、嘉陵江组膏盐岩和上三叠统—侏罗系泥岩。具有发育厚度大且稳定,连续性好,物性致密的特征。这为灯影组储层提供了良好的静态保存条件。米仓山南缘滑脱褶皱带震旦系灯影组储层虽具备良好的储源条件,并曾形成过大规模古油藏,但上覆盖层遭受了严重的构造隆升剥蚀作用和断层切割作用,已不具有油气保存能力。因此,该地区不具备油气勘探前景。而川北拗陷盆地叠加褶皱带东南缘的通南巴背斜震旦系灯影组储源条件较米仓山南缘滑脱褶皱带差,但保存条件完好,具有良好的油气勘探前景。
[Abstract]:The Sinian Dengying Formation in the front of Cangshan is an important horizon for oil and gas exploration. This paper, focusing on the Tianxing 1 well and the Nanjiang Yang Ba section, analyzes the characteristics of the development of the source rocks of the Sinian Dengying Formation, the characteristics of the reservoir development, the characteristics of the development of the asphalt and the preservation conditions of the oil and gas, and discusses the area of the front edge of the rice Cangshan. The lower Cambrian formation in the front edge of the Sinian system is the main source rock of the Sinian Dengying group, which is the main source rock of the Dengying group of the Sinian system, the black carbonaceous shale in the shelf sedimentary environment, the silty siltstone with silty mudstone and the type of organic matter I, which is in the over mature stage, and the vitrinite reflectivity presents the distribution characteristics of the East High West low. The highest (Ro3.0%) and the lowest (Ro1.5%) in the southwest edge of the green bamboo garden and the Yang Ba area in the south-east edge (Ro1.5%). The abundance of organic matter is low (the average value of Tianxing 1 is 1.21%, the average of Yang Ba section is 2.34%), showing the North High South low, gradually decreasing from the mountain to the basin, and gradually decreasing along the East and west sides of the basement uplift of Cangshan. The effective hydrocarbon source rocks are thick (the thickness of Tianxing 1 well 269M, the thickness of Yang Ba section 173m), showing the distribution characteristics of the northwest thick and southeastern thin. In the southwest edge of the southwest edge of the m Cangshan basement uplift, the source rock is the best, the Nanjiang Bridge pavilion, the second. The Sinian Dengying Formation in the Sinian system of the front edge of the rice Cangshan is mainly developed in 2 sections of the Dengying group and the lamp. The lithology of the 2 section of the shadow group is mainly grape dolomite, including gravel sand debris dolomite, lamellar dolomite, algal pellet dolomite, stinite dolomite and siliceous dolomite. The pore space type is intergranular (micro) hole, dissolution hole, crack and CIS formation cave, forming intergranular (micro) hole, corrosion hole to fissure type and dissolution hole type. The 4 sections of the Dengying group are mainly sand debris dolomite, stratlite dolomite, lamellar dolomite, clot dolomite and microcrystalline dolomite. The pore space type is intergranular (micro) pore, intergranular pore, dissolution hole, lattice hole and structural fracture, and forms intergranular (micro) pore, intergranular pore and dissolution pore reservoir space group. The reservoir space is mainly composed of structural fracture, low reservoir physical property, small pore permeability correlation coefficient, fractured reservoir type and pore fracture type. Longitudinally, the 4 section of the Dengying Formation is a better reservoir section. Horizontally, the Tianxing 1 well area in the southwest margin of the Cangshan basement uplift is a better reservoir development area in the study area. The front edge of rice Cangshan The asphalt is widely developed in the Dengying Formation of the Sinian system in the area. In the longitudinal direction, the asphalt is mainly developed in 4 sections of the Dengying group. The 2 section of the Dengying group has only a small amount of bitumen in the top, and the content is obviously less than the 4 section of the light shadow group. It has the characteristics of the continuous concentration of the upper section, the high filling rate, the downward gradual dispersion and development, and the low filling rate. The main hair of the 4 sections of the shadow group is the main hair. In the top 0~80m range, the second is the middle distance to the top 90~220m, and the bottom development is the worst. On the horizontal side, the distribution of bitumen content is around the trend of decreasing gradually around the basement uplift of rice Cangshan. The cover layer of the front of the rice Cangshan is fully developed, mainly including the mudstone of the lower Cambrian bamboo Temple group, the Lower Silurian Long Ma Creek mudstone, lower - The middle three series of Lei Kou slope formation, Jialing River group plaster salt rock and upper three series Jurassic mudstone are characterized by large and stable development thickness, good continuity and dense physical property. This provides good static storage conditions for the reservoir of the Dengying Formation. Although the Sinian Dengying reservoir in the southern margin of the Southern margin of Cangshan has good storage conditions and has been formed. The upper covering layer has been subjected to severe tectonic uplift and erosion and fault cutting, and it does not have oil and gas preservation ability. Therefore, the area does not have the prospect of oil and gas exploration. The source conditions of the Dengying Formation in the Sinian system of the Tongnan Ba anticline in the southeastern margin of the superimposed fold belt in the North Sichuan depression basin are more than that of the southern margin of Cangshan. The wrinkled zone is poor, but the preservation condition is intact. It has good prospects for oil and gas exploration.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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