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首页> 外文期刊>Natural Gas Industry B >Breakthrough of natural gas exploration in the beach facies porous dolomite reservoir of Middle Permian Maokou Formation in the Sichuan Basin and its implications: A case study of the tridimensional exploration of Well JT1 in the central-northern Sichuan Basin
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Breakthrough of natural gas exploration in the beach facies porous dolomite reservoir of Middle Permian Maokou Formation in the Sichuan Basin and its implications: A case study of the tridimensional exploration of Well JT1 in the central-northern Sichuan Basin

机译：四川盆地中二叠代造口岩层的海滩面部多孔白云岩储层的天然气勘探突破及其含义：四川省中部北部JT1趋势探索的案例研究

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摘要

The neritic carbonate reservoir of Middle Permian Maokou Formation in the Sichuan Basin has been always treated as a fractured and fractured-vuggy reservoir. After realizing the breakthrough of natural gas exploration in the Lower Cambrian Canglangpu Formation in the Taihe gas bearing area of central-northern Sichuan Basin, Well JT1, a wildcat well, recently discovers a beach facies porous dolomite reservoir in the Maokou Formation above the Canglangpu Formation, and the high-yield industrial gas flow of 112.8x104 m3/d is obtained during the test. And thus, Well JT1 achieves the breakthrough of tridimensional natural gas exploration in multiple gas bearing series of strata in the vertical direction and realizes the new discovery of reservoir type in the Maokou Formation. In order to further clarify the characteristics and control factors of the beach facies porous dolomite reservoir of Maokou Formation in the Taihe gas bearing area, this paper studied its sedimentary evolution, highenergy beach facies characteristics, reservoir characteristics and following natural gas exploration direction. And the following research results were obtained. First, along the syneclise margin of central-northern Sichuan Basin develops a beach facies porous reservoir of the second Member of Maokou Formation, whose lithology is dominated by residual dolarenite and calcsparite calcarenite and reservoir space is mainly acted by intergranular pores and intercrystalline pores, with the average porosity of 4.9%. Second, in the middle and late stage of Maokou period, Guangyuan-Bazhong paleo faulted depression was developed in the northern Sichuan Basin and intraplatform low was developed in the centralnorthern Sichuan Basin. In the central and the northern Sichuan Basin, the high-energy beach of Maokou Formation is distributed around the faulted depression and the syneclise margin in a large scale, and the paleogeographic pattern of “one-margin and three-high belt” is presented. Third, under the control of high-energy beach facies, the Maokou Formation porous reservoir in the central-northern Sichuan Basin is distributed along the “one-margin and three-high belt” in a large scale. The high-energy beach facies of “one-margin and three-high belt” covers the area of 6500 km2. In this area, multiple sets of source rocks (Cambrian, Silurian and Permian) are developed vertically, hydrocarbon source fault is developed and carrier system is good, which is favorable for the large-scale hydrocarbon enrichment and accumulation. In conclusion, there are geological conditions for the development of facies controlled porous reservoir in the Maokou Formation of the Sichuan Basin, and the “one- margin and three-high belt” is the favorable area for the exploration of beach facies porous dolomite reservoir. The research results point out the new exploration field and direction for the large-scale increase of natural gas reserves in the Sichuan Basin.
机译：四川盆地中二叠代造口岩层的编号碳酸盐液储层一直被视为骨折和骨折水库。在北部北部北部的太和气体轴承面积的下寒武纪Cangrangpu形成的天然气勘探的突破之后，野猫队的野猫，最近发现了一个海滩面部多孔白云岩储层在Canglangpu的形成之上，在测试期间获得112.8x104m3 / d的高收益工业气体流动。因此，JT1在垂直方向上的多个气体轴承系列中的三维天然气勘探实现了三维天然气勘探，并实现了Maokou地层中的储层类型的新发现。为了进一步阐明泰河煤气轴承面积Maokou形成的海滩面部多孔白云岩储层的特点和控制因素，研究了其沉积演化，高效海滩相位特征，水库特征以及追随天然气勘探方向。并获得以下研究结果。首先，沿着四川北部北部北部的同步率开发了茅岩地层第二件成员的海滩面部，其岩性由残留的含多甲岩和钙石岩钙质和储层空间主要由晶状体孔隙和肾间毛孔作用平均孔隙率为4.9％。二，在造口期的中期和晚期，广园 - 巴宏古戈病失萧条是在四川盆地北部开发的，在四川盆地中部地区开发了史上的底层盆地。在中部和北四川盆地中，造口造成的高能量海滩分布在大规模的断层抑制和同步缘，并提出了“单缘和三高带”的古地理图案。第三，在高能量海滩面部的控制下，四川盆地中部北部地区造桶地层多孔水库分布在大规模的“单缘和三高带”分布。 “一利润率和三大皮带”的高能量海滩相占地面积6500平方公里。在该领域，垂直开发了多组源岩（寒武纪，硅藻土），开发了碳氢化合物源断层，载体系统良好，这有利于大规模的烃富集和积累。总之，在四川盆地的造冢地层中，存在面部控制多孔水库的地质条件，“单边缘和三大皮带”是海滩面部多孔白云岩储层勘探的有利区域。研究结果指出了四川盆地天然气储量大规模增加的新探索领域和方向。

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