川中荷包场地区三叠系嘉二段储集特征及成藏条件研究

荷包场地区位于四川盆地中部的平缓鼻状构造,目前已在下三叠统嘉陵江组二段获工业气流。该文主要通过岩心及薄片鉴定、扫描电镜以及测井试井等分析手段,重点研究了嘉二段的储集特征,认为其主要储集空间为溶蚀孔、晶间孔和裂缝,储层类型主要为裂缝-孔隙型,其中嘉二上段为主要的勘探目的层。文章还探讨了嘉二气藏的形成条件,认为嘉二气藏的形成是受沉积成岩作用、古今构造变迁以及区域石膏层发育等地质因素控制。

ON RESERVOIR CHARACTERISTICS AND OCCURRING CONDITIONS OF JIA-2 GAS POOLS OF TRIASSIC IN HEBAOCHANG AREA OF THE CENTRAL SICHUAN BASIN

Hebaochang area is a gentle nose located in the central Sichuan Basin. By now, a few commercial gas wells have been drilled in Jia-2 sequence of Jialinjang Formation, Lower Triassic. The reservoir characteristics of this sequence are studied in this paper by means of analysing the cores, thin sections, scanning electronic microscope, well loggings and well tests. It is considered that the reservoir spaces are mainly the dissulution pores, intercrystal pores and fractures, and the reservoirs mainly belong to the fractured-pore type, in which the upper part of this sequence is the chief target for gas exploration. Mean while, the occurring conditions of the Jia-2 gas pools have been discussed that these gas pools are controlled by the geological factors of the sedimentation, diagenesis, structural evolution and the development of gypsum strata.