塔河油田塔深6井蓬莱坝组硅质岩成因及其地质意义

doi:10.11743/ogg20200108

Abstract

Abstract:

Restricted platform facies is common in the Penglaiba Formation of the Lower Ordovician in the Tarim Basin. This is especially true in Tahe area, where the early drilling data reveal that the Penglaiba Formation is mainly composed of moderate-to-thick-bedded very fine to fine crystalline dolomites. However, drilling data of Well Tashen 6 in the southwest of Tahe area reveal that the Penglaiba Formation is quite heterogeneous in terms of lithology in this area and is mainly composed of intraclast dolostones, dark gray brecciated siliceous rocks and light gray laminar siliceous rocks, within which a set of light gray laminar siliceous rocks of nearly 60 m in thickness was developed. Through core observation, conventional thin section examination, well logging and seismic facies analyses, we identified that the sedimentary setting of Penglaiba Formation in Well Tashen 6 is locally low within the restricted platform, about 300 m long from north to south and 200 m wide from east to west, with a higher relief up to hundreds of meters. Therefore, the collapse therein could produce a mixed accumulation of brecciated siliceous rocks and intraclast dolostones, and form homogeneous laminar siliceous rocks constructed by shallow-water silicogenic organisms, quite different from the thick-bedded dolomite assemblage of the surrounding restricted platform typical in the area. The laminar siliceous rocks are characterized by medium porosity and lower permeability as well as reservoir space dominated by massive micropores with a diameter of 1-6 μm. And traces of ancient microorganisms such as hyphae are seen therein. In conclusion, it can be confirmed that the siliceous rocks in the Penglaiba Formation in Well Tashen 6 are mainly of mechanical collapse origin induced by the special topography and shallow-to-semi-deep water biogenesis. This is of great significance to enriching and deepening understanding of the Ordovician sedimentary evolution and reservoir genetic mechanism in the Tarim Basin.

Key words: siliceous rock, intraclast dolomite, Well Tashen 6, Penglaiba Formation, Lower Ordovician, Tahe oilfield, Tarim Basin

CLC Number:

TE122.2

Yongli Liu, Donghua You, Lijun Gao, Weifeng Zhang, Chengfei Xie. Genesis and geological significance of siliceous rock in Penglaiba Formation in Well Tashen 6, Tahe oilfield[J]. Oil & Gas Geology, 2020, 41(1): 83-91.

Figures/Tables 9

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Genesis and geological significance of siliceous rock in Penglaiba Formation in Well Tashen 6, Tahe oilfield

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