深层碳酸盐岩原位模拟实验及勘探启示——以川东北地区二叠系为例

作    者:王明筏,陈 超
单    位:(中国石化勘探分公司)
基金项目:受国家科技重大专项“四川盆地碳酸盐岩沉积、成岩与深部优质储层发育研究”等资助
摘    要:
关于川东北深层海相碳酸盐岩溶蚀型孔隙的成因,主要有两种观点:早期的大气淡水溶蚀和浅埋藏白云石化以及晚期的深埋藏流体溶蚀。以二叠系石灰岩和白云岩为例,通过原位模拟实验分析得知:随着埋深、温度的增加,方解石和白云石均趋向于胶结而不是溶蚀,其中方解石胶结程度更高。因此判定深部碳酸盐岩储层总体上发生溶蚀作用而形成孔隙的可能性较小,早期的成岩作用才是形成次生溶蚀的关键。
关键词:四川盆地;二叠纪 碳酸盐岩储层;孔隙成因;溶蚀;胶结;原位模拟实验

In-situ Simulations and Experiments of Deep Carbonate Rocks and Its Implications for Exploration:Take Permian Samples in Northeast Sichuan as an Example

Author's Name: Wang Mingfa, Chen Chao
Institution: Sinopec Southwest Scientific Research Base
Abstract:
There are two viewpoints about the genesis of dissolution pore in deep marine carbonate rocks in Northeast Sichuan as follows: (1) Early meteoric water and shallow burial dolomitization; (2) Late burial dissolution of fluid. Through in-situ simulations and experiments on Permian samples,it shows that with the increase of depth and temperature, calcite and dolomite are tend to be cement rather than dissolution, and the calcite cement is of greater extent. Therefore, the possibility of deep dissolution is few, while the early diagenesis is the key to the formation of secondary dissolution. The sedimentary facies of marine strata and the evolution law of secondary pores in deep burial stage should be further explored.
Keywords: Carbonate reservoir; Pore genesis; Dissolution; Cementation; Deep burial condition; In-situ simulation; In-situ experiment; Permian; Sichuan Basin
投稿时间: 2017-05-24  
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