Marine Shale Gas Differential Enrichment Structure Models in South China
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摘要: 华南海相页岩层系生烃后大多经历了多期复杂的构造叠加改造，形成了多类型的构造样式，且不同样式页岩气富集程度差异明显.通过对华南数十口页岩气探井及涪陵页岩气田300多口开发井的分析测试、测井及地震资料的详细解剖，并结合实钻效果分析，建立了一套直接与间接指标相结合适用于华南海相页岩含气性评价的指标体系；并针对华南典型的挤压构造背景，在重点考虑构造紧闭程度（宽缓、窄陡及破碎）和构造形态（正向、负向及斜向）差异性的基础上，提出了24种表征页岩气差异富集的构造模式.指出在区域构造背景相同的前提下，宽缓型构造模式是页岩气富集的最有利模式，窄陡型次之，破碎型最差.Abstract: Most of the marine shale strata in South China have undergone poly-cycle complex structural superimposition and reformation after hydrocarbon generation, forming many types of structural styles, and the enrichment degree of shale gas in different styles is obviously different.Based on the analysis, testing and the detailed anatomy of the logging and seismic data in dozens of shale gas exploration wells in South China, and more than 300 development wells in the Fuling shale gas fields, a set of direct and indirect indicators for shale gas bearing evaluation in South China are established combining with actual drilling results.Based on the typical background of extrusion structure in South China, focusing on the structural tightness (broad, narrow and steep, fractured) and structural forms (positive, negative and oblique), 24 structural models representing the differential enrichment of shale gas are proposed.Under the premise of the same macroscopic structural background, the broad structural model is the most favorable mode for shale gas enrichment, followed by the narrow-steep type, and the fractured type is the worst.
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Key words:
- South China /
- marine /
- shale gas /
- differential enrichment /
- structure models /
- petroleum geology
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图 1 华南海相页岩气差异富集构造模式
Fig. 1. Structural pattern of differential enrichment of marine shale gas in South China
图 2 “宽缓型”页岩气富集构造模式
a.宽缓背斜型；b.宽缓向斜型；c.宽缓断背斜型；d.宽缓单斜型
Fig. 2. Shale gas enrichment structure model of "broad type"
图 3 “窄陡型”页岩气富集构造模式
a.窄陡断背斜型；b.窄陡向斜型；c.窄陡双向冲断向斜型
Fig. 3. Shale gas enrichment structure model of "narrow and steep type"
图 4 “破碎型”页岩气富集构造模式
a.单层破碎背斜型；b.多层破碎型断背斜；c.多层破碎斜坡型
Fig. 4. Shale gas enrichment structure model of "fractured type"
表 1 涪陵页岩气田含气性评价指标体系
Table 1. Gas-bearing evaluation index system of Fuling shale gas field
含气饱和度
(%)电阻率
(Ω·m)实测含气量
(m3/t)水平井气测全烃值(%) 孔隙度
(%)地层压力系数 Ⅰ类 ＞65 ＞20 ＞4 ＞10 ＞4 ＞1.3 Ⅱ类 50~65 2~4 5~10 3~4 1.1~1.3 Ⅲ类 ＜50 < 20 ＜2 ＜5 ＜3 ＜1.1 
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