Abstract The Donghe Sandstone was broadly deposited in the early stage of the marine transgression, but it is not an isochronous stratigraphic unit It was deposited from the late Late Devonian to the early Early Carboniferous with various depositional ages in different areas. It has an outstanding feature of filling and leveling up. Its sedimentary facies were controlled by the marine transgression speed, the sediments supply and the pre-transgression palaeotopography. In the northern Tarim Basin, which was blocked by the Tabei paleo uplift, the seawater stayed around the paleo uplift for a long period, combined with this, the coarse grained sediments supply, the shore beach deposits were developed. In the central Tarim Basin, however, the sedimentary facies are complex because of the complex topographic setting. Fluvial deposits were developed in the basal conglomerate member, and estuary and shore beach deposits in the massive sandstone member and the sandy conglomerate member. Different members have their own characteristics of composition, sorting and grain size While in other gentle slope and flat areas of the Tarim Basin, rapidly-deposited shore and shelf sediments were developed during the transgressive period Controlled by the sedimentary environments, the effective reservoirs of the Donghe Sandstone are distributed in certain zones. Besides the sedimentary factors, the low paleogeothermal gradient and the short-term deep burial history are the other two crucial factors controlling the development of the high-quality Donghe Sandstone reservoir.
About author: Gu Jiayu, born in 1944, is a professoral engineer in Research Institute of Petroleum Exploration m Development, PetroChina and is mainly engaged in petroleum geology and reservoir research.
Cite this article:
Gu Jiayu,Zhang Xingyang,Guo Bincheng. Characteristics of sedimentation and reservoir of the Donghe Sandstone in Tarim Basin and their synthetic analysis[J]. JOPC, 2006, 8(3): 285-294.
Gu Jiayu,Zhang Xingyang,Guo Bincheng. Characteristics of sedimentation and reservoir of the Donghe Sandstone in Tarim Basin and their synthetic analysis[J]. JOPC, 2006, 8(3): 285-294.
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