吐哈盆地下侏罗统致密砂岩气藏特征与勘探方向

为进一步明确吐哈盆地下侏罗统致密砂岩气藏特征与勘探方向，开展了吐哈盆地下侏罗统致密砂岩气藏类型、成藏特征、有利勘探方向评价研究。认为吐哈盆地下侏罗统致密砂岩气藏分为背斜构造型、构造—岩性复合型和动力圈闭型3类，构造—岩性复合型致密砂岩气藏主要分布于胜北生气中心及周缘，储集砂体主要为湖底扇砂砾岩和三角洲前缘砂体，综合评价为II类储层，是勘探最有利的气藏类型。研究结果表明：①湖底扇砂砾岩、三角洲前缘细砂岩与构造匹配形成构造—岩性复合型致密砂岩气藏，砂砾岩、粗砂岩的抗压实能力优于细砂岩，粗粒度砂体的储集物性优于细粒砂体；②吐哈盆地下侏罗统致密砂岩气资源量为2 400×10⁸ m³，胜北洼陷是最有利生气中心，勘探潜力大；③三工河组储层可分为4类，位于胜北生气中心的胜北洼陷南部斜坡带、胜北洼陷洼中隆起区、鄯善弧形带三工河组储层主要为Ⅱ类、Ⅲ类储层，是致密砂岩气的主要勘探有利区。

Characteristics and exploration direction of tight sandstone gas reservoirs in the Lower Jurassic of Turpan-Hami Basin

In order to further clarify the characteristics and exploration directions of the Lower Jurassic tight sandstone gas reservoirs in the Turpan-Hami Basin， the evaluation research on the types， accumulation characteristics， and favorable exploration directions of the Lower Jurassic tight sandstone gas reservoirs in the Turpan-Hami Basin has been carried out. It is believed that the Lower Jurassic tight sandstone gas reservoirs in the Turpan-Hami Basin can be divided into three types：Anticline structure type， structure-lithology compound type and dynamic trap type. The structure-lithology compound type tight sandstone gas reservoirs are mainly distributed in the Shengbei gas generation center. And the periphery， the reservoir sandbodies are mainly sublacustrine fan glutenite and delta front sandbodies， comprehensively evaluated as Type II reservoirs， and are the most favorable gas reservoir type for exploration. The research results show that： （1） The sublacustrine fan glutenite and fine sandstone at the delta front match the structure to form a structure-lithological compound tight sandstone gas reservoir. The compaction resistance of glutenite and coarse sandstone is better than that of fine sandstone and coarse-grained sand. The reservoir properties of the sand body are better than those of fine-grained sand bodies. （2） The Lower Jurassic tight sandstone gas resources in the Turpan-Hami Basin are 2 400×10⁸ m³， and the Shengbei subsag is the most favorable gas generating center with great exploration potential. （3） The reservoirs of the Sangonghe Formation can be divided into four types. The reservoirs of the Sangonghe Formation in the southern slope zone of the Shengbei Sag， the central uplift area of the Shengbei Sag， and the Shanshan， which are mainly Type II， are the main favorable targets for exploration of tight sandstone gas.