Dolomite Composition and Texture Constrain the Formation of MicroporeReservoir: An Example from Low Paleozoic Dolomite, Tarim Basin
Received date: 2008-01-11
Revised date: 2008-04-08
Online published: 2008-06-10
The lower Paleozoic dolomite sequences are important petroleum reservoirs in the Tarim basin. After a long and complex diagenetic process, the secondary dissolution pores are the main reservoir spaces. The distribution of the micro\|porosities is wide and not uniform. The diverse\|dissolution between calcite and dolomite during the burial is considered as an important mechanism for the micro\|porosities reservoir system’s formation based on the observation of plenty of well thin sections and micro\|photos, as well as the EPMA data, and this process is constrained by the components and textures of dolomite despite the influence of fluids. Limestone bearing dolomite and calcitic dolomite are the main reservoir rocks with reference to the component of dolomite. However, not all the calcite can be dissolved during the burial process. The distribution type of the calcite in the dolomite has been used to subdivide the sucrosic dolomite into three types, including intercrystalline filling type, innercrystalline filling type and inter\|innercrystalline filling mixed type, and the intercrystalline filling sucrosic dolomite can form fine micro\|porosities during burial dissolution.
WANG Xiao-lin ;HU Wen-xuan ; ZHANG Jun-tao ;QIAN Yi-xiong, ZHU JING-quan ; WU Shi-qiang . Dolomite Composition and Texture Constrain the Formation of MicroporeReservoir: An Example from Low Paleozoic Dolomite, Tarim Basin[J]. Natural Gas Geoscience, 2008 , 19(3) : 320 -326 . DOI: 10.11764/j.issn.1672-1926.2008.03.320
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